you conduct calorimetry experiments, which yield a delta hrxn of -376.7 kj/mol for the reaction of mg(s) and 3 m hcl(aq) and a delta hrxn of -86 kj/mol for the reaction of mgo(s) and 3 m hcl(aq). assuming that the formation of water: h2(g) 1/2 o2(g) -> h2o(l) has a delta hrxn of -285.8 kj/mol, what is the delta hf of mgo(s) ? (hint: use the slide deck for guidance).
Answers
To solve for the enthalpy of formation of MgO (delta Hf of MgO), we need to use Hess's Law, which states that the enthalpy change of a reaction is independent of the pathway between the initial and final states.
What is the delta hf of mgo(s) ?First, let's write out the chemical equations for the reactions given:
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) ΔHrxn = -376.7 kJ/mol
MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) ΔHrxn = -86 kJ/mol
H2(g) + 1/2O2(g) → H2O(l) ΔHrxn = -285.8 kJ/mol
Notice that the second reaction is the desired reaction for which we want to determine the enthalpy of formation of MgO. We can use the first and third reactions to manipulate them into the desired reaction.
To do this, we'll reverse the third reaction and multiply it by 2, then add it to the first reaction to cancel out the H2 and produce MgO:
2H2(g) + O2(g) → 2H2O(l) ΔHrxn = 2(-285.8 kJ/mol) = -571.6 kJ/mol
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) ΔHrxn = -376.7 kJ/mol
Mg(s) + O2(g) + 2HCl(aq) → MgCl2(aq) + H2O(l) ΔHrxn = -376.7 kJ/mol - 571.6 kJ/mol = -948.3 kJ/mol
Now, we need to cancel out the HCl to get the desired reaction:
Mg(s) + O2(g) + 6HCl(aq) → MgCl2(aq) + 3H2O(l) ΔHrxn = -3(-86 kJ/mol) = 258 kJ/mol
Notice that we multiplied the second reaction by 3 to match the number of moles of HCl in the first reaction.
Finally, we need to solve for the enthalpy of formation of MgO:
Mg(s) + 1/2O2(g) → MgO(s) ΔHf of MgO = ΔHrxn / moles of MgO
ΔHf of MgO = 258 kJ/mol / (1 mol) = -258 kJ/mol
Therefore, the enthalpy of formation of MgO is -258 kJ/mol.
Learn more about the enthalpy of formation from
https://brainly.com/question/15074670
#SPJ1
Related Questions
How much hcl must be added to a liter of buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate to result in a buffer ph of 4. 01?]
Answers
For a liter of a buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate, and with a result in a buffer pH of 4.01, the moles of HCl required is mathematically given as x=0.313mol
What is the result in a buffer ph of 4. 01?Generally, the equation for the pH is mathematically given as
pH=pKa+logsalt/acid
Generally, the equation for the Chemical Reaction is mathematically given as
HCl+CH3CooNa---->NaCl+CH3OOH
Therefore
4.01=4.74+log\frac{0.8-x}{1.3+x}
-0.52=log\frac{0.8-x}{1.3+x}
x=0.313mol
In conclusion, The moles of HCl required is
x=0.313mol
Read more about Chemical Reaction
https://brainly.com/question/6876669
Buffer is a solution that prevents pH variation in a solution when base or acid is added. In a liter of buffer 0.313 mol of hydrochloric acid must be added.
What is pH?pH is the potential of hydrogen and is given as,
\(\rm pH =\rm pKa + log \dfrac{salt}{acid}\)
The chemical reaction is given as,
\(\rm HCl+CH_{3}COONa \rightarrow NaCl+CH_{3}OOH\)
Given,
pH =4.01
pKa = 4.74
Concentration of salt = 0.8 - x
Concentration of acid = 1.3 + x
Substituting values in the pH formula:
\(\begin{aligned} 4.01 &= 4.74 + \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\-0.52 &= \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\&= 0.313 \;\rm mol\end{aligned}\)
Therefore, 0.313 moles of HCl are needed.
Learn more about buffers here:
https://brainly.com/question/9875355
#SPJ4
which item would most likely end up in the waste stream soonest
Answers
The item that would most likely end up in the waste stream soonest is a single-use plastic item, such as a plastic bag or disposable plastic utensil. These items are designed for short-term use and are typically discarded shortly after use.
The item that would most likely end up in the waste stream soonest would be a disposable plastic water bottle. These bottles are commonly used and quickly disposed of after a single use, contributing to the waste stream more quickly than other durable or reusable items. In general, reducing waste generation, practicing responsible consumption, and promoting recycling and other sustainable waste management practices can help minimize the impact of waste on the environment.
Learn more about waste management here:
https://brainly.com/question/12621971
#SPJ11
If you are given 68.4 grams of Mgo, how many moles is this?
Answers
68.4 grams of MgO is equal to 1.70 moles.
Define molesA mole is a unit of measurement for the amount of a chemical substance. It is defined as the number of entities (atoms, molecules, ions, electrons, etc.) in a substance that is equal to Avogadro's number, which is approximately 6.022 x 10^23 entities.
To convert the mass of MgO (magnesium oxide) to moles, you can use its molecular weight. The molecular weight of MgO is 40.3 g/mol. So, to find the number of moles, you can divide the mass of MgO by its molecular weight:
68.4 g MgO / 40.3 g/mol = 1.70 moles
So, 68.4 grams of MgO is equal to 1.70 moles.
Learn more about Moles here:
https://brainly.com/question/26416088
#SPJ4
The solubility of a gas in a liquid varies in proportion to the partial pressure of that gas in the overlying space. This relationship is known as:
a) Henry's Law
b) Guy-Lussac's Law
c) The Henderson-Hasselbach equation
d) Dalton's Law
Answers
The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.
This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.
For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.
Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.
To know more about Henry's Law. please visit.....
brainly.com/question/24136715
#SPJ11
in chemistry class, students have been discussing the differences between physical and chemical changes. the students carried out several procedures and recorded their observations. the students determined that one of the procedures is an example of a physical change, but not a chemical change.
Answers
Answer:
C, Reactants rearrange to form new products
Explanation:
How many grams of lithium sulfide (Li2S) are in 275 g of a 16 % aqueous solution of Li2S?
Answers
Answer:
600 mAh·g−1
Explanation:
i hope this is good let me know if its wrong
What the common uses for Rutherfordium???
Answers
Answer:
welcome
Explanation:
Uses of Rutherfordium
Because rutherfordium is made within the lab, there are not very many uses for this element commercially. On the other hand, rutherfordium has been used within the laboratory setting to conduct research. Most elements that are highly radioactive are used for nuclear power and medicinal purposes.
Helppp. Calcium reacts with bromine to form Calcium bromide
Ca - - - - > Ca+2
Br2 - - - - > 2br
A. Complete the equation by adding electrons
Answers
\(\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}\)
Actually Welcome to the Concept of the Chemical Bonding.
Since we know that, calcium shares 2 electrons and Bromide being a halogen accepts 1 electron at a time,
So 2 bromides combine together to form a bond with Calcium, so we get as,
Ca2+ + 2Br -----------------------> CaBr2
CaBr2 is the compound formed.
What happens when potatoes are placed in sugar water?
Answers
Because potatoes already contain sugar, less water will evaporate when they are submerged in sugar water. Because it will absorb water, the slice placed in water will become hard.
Answer:
-
Explanation:
Since potatoes already contain sugar, less water will diffuse out of the potato placed in sugar water. The slice placed in water will be rigid, since it will absorb water.
T or F? Potential energy is limited to electromagnetic, mechanical, and nuclear energy.
Answers
How many senses does the human body have?
O A. 3
B. 5
Answers
Answer:
B
Explanation:
sight, hearing, smell, taste and touch
Answer:
Most easiest answer..
There are 5 senses in human body.☺️
How many electrons are actually in the composite band for Fe?
Express your answer numerically as an integer.
Answers
There are 12 electrons in the composite band for Fe.
The number of electrons in the composite band for Fe can be determined by considering its electron configuration. Iron (Fe) has an atomic number of 26, which means it has 26 electrons in total. The electron configuration of Fe is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6.
The composite band includes the valence band and any partially filled bands below it. In the case of Fe, the valence band consists of the 4s and 3d orbitals. Since the 4s orbital can hold up to 2 electrons and the 3d orbital can hold up to 10 electrons, the total number of electrons in the composite band for Fe is 2 + 10 = 12.
Therefore, there are 12 electrons in the composite band for Fe.
The composite band of Fe consists of the valence band and partially filled bands below it. In Fe, the valence band includes the 4s and 3d orbitals. The 4s orbital can hold 2 electrons, and the 3d orbital can hold 10 electrons. Thus, there are 12 electrons in the composite band of Fe.
To know more about valence band, visit:
https://brainly.com/question/33354068
#SPJ11
What occurs as the atomic number of the elements in Period 2 increases?
1)The nuclear charge of each successive atom decreases, and the atomic radius decreases.
2)The nuclear charge of each successive atom decreases, and the atomic radius increases.
3)The nuclear charge of each successive atom increases, and the atomic radius decreases
4)The nuclear charge of each successive atom increases, and the atomic radius increases.
Answers
Answer:
3)The nuclear charge of each successive atom increases, and the atomic radius decreases
Explanation:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
How do I calculate the percent yield?For a Diels-Alder reaction lab, my lab group reacted 0.302 g of anthracene (diene) and 0.158 g of maleic anhydride (dienophile).Our final product (solid) weighed 0.249 grams. How do I calculate our percent yield?
Answers
The percent yield of the Diels-Alder reaction between 0.302 g of anthracene and 0.158 g of maleic anhydride to produce 0.249 g of the product is 89.9%.
To calculate the percent yield of the Diels-Alder reaction, you need to use the following formula:
Percent yield = (actual yield / theoretical yield) x 100%
To determine the theoretical yield, you need to first calculate the limiting reagent. In this case, the limiting reagent is the reactant that is completely consumed in the reaction, which can be found by comparing the mole ratio of the reactants to the balanced equation of the Diels-Alder reaction.
The balanced equation for the Diels-Alder reaction between anthracene and maleic anhydride is:
Anthracene + Maleic anhydride → endo-7,8-dihydroxy-4,5-epoxy-3-methoxy-10-methyl-1,2,3,4,4a,5,6,7-octahydrophenanthrene-2,3-dicarboxylic acid anhydride
The mole ratio of anthracene to maleic anhydride is 2:1, which means that for every 2 moles of anthracene, 1 mole of maleic anhydride is required. Therefore, the theoretical yield can be calculated based on the amount of limiting reagent, which in this case is the maleic anhydride.
To determine the moles of maleic anhydride used in the reaction, you need to convert the mass given to moles using its molar mass. The molar mass of maleic anhydride is 98.06 g/mol.
0.158 g / 98.06 g/mol = 0.00161 mol
Since maleic anhydride is in a 2:1 ratio with anthracene, the moles of anthracene used in the reaction can be calculated as follows:
0.00161 mol / 2 = 0.000805 mol
Now that you have the amount of limiting reagent (maleic anhydride) used in the reaction, you can calculate the theoretical yield based on the balanced equation. The balanced equation shows that 1 mole of maleic anhydride reacts with 1 mole of anthracene to produce 1 mole of the product. Therefore, the theoretical yield can be calculated as follows:
0.000805 mol x (344.34 g/mol) = 0.277 g
Now you can calculate the percent yield using the formula mentioned earlier:
Percent yield = (actual yield / theoretical yield) x 100%
Percent yield = (0.249 g / 0.277 g) x 100%
Percent yield = 89.9%
Therefore, the percent yield of the Diels-Alder reaction between 0.302 g of anthracene and 0.158 g of maleic anhydride to produce 0.249 g of the product is 89.9%.
Learn more about Diels-Alder reaction here
https://brainly.com/question/30751490
#SPJ11
According to Boyle’s Law, if temperature and number of gas particles are held constant, what happens to the pressure of a system when the volume is decreased?
Answers
Determining polarity for group 2 compounds N2 HCN H30+ 12 NH4* CH20 2 4 N/A N/A Steric # Choose... linear Choose... Choose Choose... Choose Choose... Choose Electron Geometry N/A N/A # of bonding electron groups 2 N/A N/A 0 0 # of lone pairs N/A N/A Choose... linear Choose... trigona Choose... Choose Choose... Choose Molecular Geometry N/A N/A How many bonds have a dipole? 0 2 If present, do the dipoles cancel each other? Choose... N/A Choose... No Choose... Choose Choose... Choose Choose... Choose Choose... Choose Is this molecule polar? Choose... No Choose... Yes Choose... Yes Choose... Choose Choose... Choose Choose... Choose (2pts) Molecules with Multiple Central Atoms
Answers
The difference in electronegativity between the atoms and the molecular geometry determines a molecule's polarity.
\(N_2\): The molecule is linear with a steric number of 2. There are no lone pairs and no bonds have a dipole, so the molecule is nonpolar.
\(HCN\): The molecule is linear with a steric number of 2. There are no lone pairs and two bonds have a dipole. The dipoles do not cancel each other out, so the molecule is polar.
\(H_3O^+\): The molecule is trigonal planar with a steric number of 3. There are no lone pairs and three bonds have a dipole. The dipoles do not cancel each other out, so the molecule is polar.
\(NH_4^+\): The molecule is tetrahedral with a steric number of 4. There are no lone pairs and four bonds have a dipole. The dipoles cancel each other out, so the molecule is nonpolar.
\(CH_2O\): The molecule is trigonal planar with a steric number of 3. There is one lone pair and two bonds have a dipole. The lone pair affects the molecular geometry, making it bent. The dipoles do not cancel each other out, so the molecule is polar.
Overall, the polarity of a molecule depends on the electronegativity difference between the atoms and the molecular geometry. A molecule with polar bonds can be nonpolar if the dipoles cancel each other out, while a molecule with nonpolar bonds can be polar if the molecular geometry is asymmetrical.
Learn more about geometry here
https://brainly.com/question/31408211
#SPJ11
Explain why gold is found in its unreacted form, as the metal
itself in the Earth.
Answers
The unique combination of gold's chemical properties, stability, and the geological processes that occur in the Earth's crust, all contribute to the formation of gold in its unreacted form as the metal itself.
What makes gold found in it's unreacted form?Gold is found in its unreacted or pure form in the Earth's crust because of its chemical properties. Gold is often found in geologically active areas such as fault lines and volcanic fields.
In these regions, high temperatures and pressures cause gold to move in a molten state, eventually leading to subsidence and vein formation.
Therefore, the unique combination of gold's chemical properties, stability, and the geological processes that occur in the Earth's crust, all contribute to the formation of gold in its unreacted form as the metal itself.
learn more about gold's chemical properties: https://brainly.com/question/31099138
#SPJ1
Sketch portions of a linear polystyrene molecule that are (a) syndiotactic, (b) atactic, and (c) isotactic. Use two-dimensional schematics per footnote 8 of this chapter
Answers
A polymer called polystyrene (PS) is created from the liquid hydrocarbon styrene, which is produced commercially from petroleum.
The monomers of the aromatic hydrocarbon styrene are converted into a synthetic polymer known as polystyrene. Polystyrene can be either foamed or solid. For normal use, polystyrene is clear, hard, and brittle. It is a fairly priced resin when measured by weight. It has a weak barrier to oxygen and water vapor and a relatively low melting point. Polystyrene is commonly used to preserve consumer items in both solid and foam forms. In order to protect food from damage or spoiling, polystyrene is frequently used to produce CD and DVD covers, foam shipping peanuts, food packaging, meat/poultry trays, and egg cartons.
Learn more about Polystyrene
brainly.com/question/912173
#SPJ4
Pls this is very important for me. Whoever answer this whole I'll mark them as brainliest..... The question is many cars have catalytic converters in their exhaust systems. In a catalytic converter most of the Co and No are formed in a car engine is changed into less harmful products. Identify these products and state the metal catalyst used.
Answers
The most commonly used metal catalyst in catalytic converters is platinum (Pt) among the other possible metals that could also be used in this regard.
What is a catalytic inverter?
Through a sequence of chemical reactions, carbon monoxide (CO) and nitrogen oxides (NOx) produced by an automobile engine are transformed into less hazardous compounds in a catalytic converter.
We know that the catalytic inverter can be able to convert carbon monoxide into carbon dioxide and can also be able to convert nitrogen monoxide to nitrogen dioxide.
Learn more about catalytic inverter:https://brainly.com/question/2928110
#SPJ1
The standard unit for measuring volume is the _____.
milliliter
liter
deciliter
cubic centimeter
Answers
Pls help!!!!!! a student wants to make up a 150cm squard solution of sodium hydroxide, the concentration of the sodium hydroxide is 3. 0 mol/dm squard,explian in short steps you would follow this solution include all relevant equipment and calculations
Answers
To prepare a 150 cm² solution of 3.0 mol/dm² sodium hydroxide, dissolve 0.9 moles (54 g) of sodium hydroxide pellets in water using a volumetric flask.
Calculate the number of moles required: Concentration (mol/dm²) × Volume (dm³) = 3.0 mol/dm² × 0.15 dm³ = 0.45 moles. Convert moles to grams: Sodium hydroxide has a molar mass of 40 g/mol, so 0.45 moles × 40 g/mol = 18 g. Weigh out 18 g of sodium hydroxide pellets using a balance. Dissolve the pellets in a small volume of distilled water to ensure complete dissolution. Transfer the solution to a 150 cm³ volumetric flask using a funnel. Rinse the funnel and container used for dissolving the pellets with distilled water to ensure all of the sodium hydroxide is transferred. Add distilled water to the flask until the solution reaches the calibration mark on the neck of the flask. Stopper the flask and mix the solution thoroughly by inverting the flask several times. Now you have a 150 cm³ solution of 3.0 mol/dm² sodium hydroxide ready for use.
learn more about sodium here:
https://brainly.com/question/30878702
#SPJ11
How would you classify raisin bran?
b
pure substance-compound
mixture-heterogeneous
pure substance-element
mixture-homogeneous
none of the above
Answers
Raisin bran is classified as a heterogeneous mixture as it has 2 distinct components bran and raisin.
Heterogeneous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.Bran and raisins are 2 distinct components present.Thus, the correct option is heterogeneous mixture.
Learn more about heterogeneous mixture,here:
https://brainly.com/question/24898889
#SPJ6
In this set of chemical reactions, which is a single replacement reaction?A) K2SO4 (aq) + BaCl2 (aq) ---> BaSO4 (s) + 2KCI (aq)B) Pb(NO3)2 (aq) + 2NaCl (aq) ---> PbCl2 (s) + 2NaNO3(aq)C) Zn (s) + H2SO4 (aq) ----> ZnSO4 (aq) + H2 (g)D) CuSO4 (aq)+ BaCl2 (aq) ----> BaSO4 (s) + CuCl2 (aq)
Answers
Explanation:
A single replacement reaction is defined as a chemical reaction where one element replaces another element in one compound. The shape of this kind of reaction is:
A + BC ----> AB + C
If we consider our options, they are all double replacement reaction except from:
Zn (s) + H₂SO₄ (aq) ----> ZnSO₄ (aq) + H₂ (g)
Where zinc is replacing hydrogen in sulfuric acid.
Answer: C) Zn (s) + H₂SO₄ (aq) ----> ZnSO₄ (aq) + H₂ (g)
Select the correct answer.
Observe the two images. What is the correct conclusion?
copper in hot
sulphuric acid
bunsen burner
copper in
hydrochloric acid
Image 1
Image 2
O A. Copper reacts with any kind of acid.
B. Copper does not react with acids.
Conner rearts with sulfuric acid when heated
Answers
What is the effective nuclear charge for magnesium?.
Answers
Answer: Heyo Kenji Here! Here's your answer- Mg =1s2 2s2 2p6 3s2 = [Ne]3s2, therefore magnesium has 10 core electrons from its 1s2, 2s2, 2p6 orbitals. Magnesium is element 12, so it has 12 protons and a nuclear charge of 12.
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
define magnetic field
Answers
Answer:
Explanation:
Magnetic field is the magnetism charge around a magnetic body
a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
This is how it looks like in a magnetic field:
assuming each solution to be 0.10 mm , rank the following aqueous solutions in order of decreasing phph . rank the solutions from the highest to lowest ph. to rank items as equivalent, overlap them. view available hint(s)for part a resethelp hoclhocl n2h4n2h4 naohnaoh hclhcl ba(oh)2ba(oh)2 lowest phhighest ph the correct ranking cannot be determined.
Answers
The pH is measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.
In chemistry, pH, traditionally denoting the ability of hydrogen, is a scale used to specify the acidity or basicity of an aqueous answer. Acidic answers are measured to have decreased pH values than basic or alkaline solutions.
The variety goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of extra than 7 shows a base. pH is surely a measure of the relative amount of loose hydrogen and hydroxyl ions inside the water.
To calculate the pH of an aqueous solution you want to recognize the awareness of the hydronium ion in moles in line with liter molarity. The pH has then calculated with the use of the expression: pH = - log [H3O+].
Learn more about pH here:-https://brainly.com/question/479591
#SPJ4
Heat is transferred at a rate of 2 kW from a hot reservoir at 825 K to a cold reservoir at 300 K. Calculate the rate at which the entropy of the two reservoirs changes. (Round the final answer to six decimal places.) The rate at which the entropy of the two reservoirs changes is 00424 kW/K.
Answers
Answer:
0.004243 KW/K.
Explanation:
From the question given above, the following data were obtained:
Heat transfered (Q) = 2 KW
Temperature of hot reservoir (Tₕ) = 825 K
Temperature of cold reservoir (T꜀) = 300 K
Next, we shall determine the entropy of both reservoir. This can be obtained as follow:
For hot reservoir:
Heat transfered (Q) = 2 KW
Temperature of hot reservoir (Tₕ) = 825 K
Entropy of hot reservoir (Sₕ) =?
Sₕ = Q/Tₕ
Sₕ = 2/825
Sₕ = 0.002424 KW/K
For cold reservoir:
Heat transfered (Q) = 2 KW
Temperature of cold reservoir (T꜀) = 300 K
Entropy of cold reservoir (S꜀) =?
S꜀ = Q/T꜀
S꜀ = 2/300
S꜀ = 0.006667 KW/K
Finally, we shall determine the change in the entropy of the two reservoirs. This can be obtained as follow:
Entropy of hot reservoir (Sₕ) = 0.002424 KW/K
Entropy of cold reservoir (S꜀) = 0.006667 KW/K
Change in entropy (ΔS) =?
ΔS = S꜀ – Sₕ
ΔS = 0.006667 – 0.002424
ΔS = 0.004243 KW/K.
Which of the following statements concerning mixtures is correct?
a. The composition of a homogeneous mixture cannot vary.
b. A homogeneous mixture can have components present in two physical states.
c. A heterogeneous mixture containing only one phase is an impossibility
d. More than one correct response..
Answers
The correct option from the given statements concerning mixtures is (d) more than one correct response.
The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.
The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).
The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.
To know more about homogeneous visit:
https://brainly.com/question/30587533
#SPJ11
According to the quantum theory, the size of an atomic orbital is most directly associated with?a) the principle quantum number(n)b) the angular momentum quantum number(I)c) the magnetic quantum number(ml)d) the spin quantum number(ms)e) the angular momentum and magnetic quantum numbers, together
Answers
According to quantum theory, the size of an atomic orbital is most directly associated with the principle quantum number (n). The correct option is a).
The principle quantum number describes the energy level of an electron in an atom, and as the value of n increases, the electron's energy and distance from the nucleus also increase. This means that the larger the value of n, the larger the size of the orbital.
The other quantum numbers, such as the angular momentum quantum number (l), the magnetic quantum number (ml), and the spin quantum number (ms), are all related to other properties of the electron, such as its shape, orientation, and spin, but they do not directly influence the size of the orbital.
Therefore, the principle quantum number is the most important factor in determining the size of an atomic orbital according to quantum theory.
To know more about quantum theory refer here:
https://brainly.com/question/4751848#
#SPJ11