Answers
Answer:
The number of moles of benzaldehyde = 0.0253 moles
Explanation:
The molecular formula of benzaldehyde is C₇H₆O
Its molecular mass is calculated from the atomic masses of the constituent atoms.
C = 12.0 g: H = 1.0 g; O = 16.0 g
Molecular mass = ( 12 * 7) + (1 * 6) + (16 * 1) = 106.0 g/mol
Number of moles of substance = mass of substance/ molar mass of the substance
mass of benzaldehyde = 2.68; molar mass = 106.0 g/mol
Number of moles of benzaldehyde = 2.68 g/ 106 g/mol = 0.0253 moles
Therefore, the number of moles of benzaldehyde = 0.0253 moles
Related Questions
How many grams of glucose are required to heat 175 mL of water from 20.0 °C to 25.0°C?
Answers
We must first determine the heat needed to heat 175mL of water. In the working temperature range we can assume that the density of water is 1g/mL, so the mass of water that we must heat will be 175g of water.
Now, the heat we need to heat that mass of water is calculated with the following equation:
\(Q=mCp\Delta T\)Where Q is the heat required to heat the water
Cp is the specific heat of water equal to 4186 J/g°C
delta T is the change of temperature = 25°C-20°C=5°C
We replace the know values:
\(Q=175g\times4186\frac{J}{g\degree C}\times\frac{1kJ}{1000J}\times5\degree C=3662.75kJ\)Now, to heat the water they tell us that the glucose combustion will take place. We must assume that all the heat generated in the reaction will go to heating the water and that there is no heat loss to the environment.
The combustion reaction of glucose generates 2538.7 kJ/mol. So the moles of glucose needed will be:
\(\begin{gathered} molGlucose=givenHeatrequired\times\frac{1molGlucose}{2538.7kJ} \\ molGlucose=3662.75kJ\times\frac{1molGlucose}{2,538.7kJ}=1.44molGlucose \end{gathered}\)We calculate the grams of glucose by multiplying the moles by the molar mass of glucose equal to 180.2g/mol
grams of glucose= 1.44 mol x 180.2 g/mol=260g
Answer: To heat 175 mL of water from 20.0 °C to 25.0°C are required 260g of glucose
Which Example is a way that intercellular communication occurs
A. A molecule is sent from one part of a cell to another
B. A signal is sent from a nerve cell to a muscle cell
C. A signal is sent down an exon within a nerve cell
D. A signal is translated into action for a muscle cell to contract
Answers
Answer:
B) A signal is sent from a nerve cell to a muscle cell.
Explanation:
The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell. Skeletal muscle tissue is composed of cells called muscle fibers.
The correct answer is:
B.(A signal is sent from a nerve cell to a muscle cell)
I took the test, hope this helps!
Key Na CE с - What does it mean if a compound ends in -ide?
Answers
Answer:
This means that there are only two elements in the compound .
Explanation:
N/A .
Which of the following is not a valid conversion factor?
Answers
It should be 1000m Instead of 1 meter/ 10 millimeter since 1m=1000mm
Answer:
d
Explanation:
HELP ME OUT PLS!!!!!!!
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is which type of galaxy?
elliptical
irregular
spiral
oval
Answers
Answer:
the spiral type of galaxy
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.
What is milky way galaxy?The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.
A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.
Therefore, the correct option is option C.
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Successful rifting can create new oceans and split apart continents. True or False
Answers
Answer:
True if by rifting you mean continental rift. If not idk.
Write the noble gas configuration for the following ground state elements:Calcium:Sulfur:
Answers
Answer:
\(\begin{gathered} Calcium\text{ - \lbrack Ar\rbrack4s}^2 \\ Sulfur\text{ - \lbrack Ne\rbrack3s}^2\text{ 3p}^4 \end{gathered}\)Explanation:
Here, we want to write the noble gas configuration for the given element'
To do this, we consider the noble gas before them
The noble gas before calcium is Argon while the one before sulfur is Neon
We have the noble gas configuration as follows:
\(\begin{gathered} Calcium\text{ : \lbrack Ar\rbrack4s}^2 \\ Sulfur\text{ : \lbrack Ne\rbrack3s}^2\text{ 3p}^4 \end{gathered}\)Turn the word equations into chemical formulas.1 Sulfur solid reacts with iron solid to form solid iron(III) sulfide.2. Hydrogen gas and iron(III) oxide powder react to form liquid water and solid iron powder.3. Magnesium metal reacts with hydrochloric acid to form magnesium chloride solution and hydrogen gas.4. Magnesium sulfide solid and hydrochloric acid react to form hydrogen sulfide gas and magnesium chloride solution.5. Oxygen gas reacts with solid copper metal to form copper(II) oxide solid.
Answers
Reaction 1
Solid sulfur can be represented by S(s) and solid iron is represented by Fe(s). Note the little s stands for solid.
Iron(III) sulfide will have the following formula:
\(Fe^{3+}+S^{2-}\rightarrow Fe_2S_3\)Reaction 2
Hyrogen gas can be represented by H2(g) and Iron (III) Oxide will have the following formula:
\(Fe^{3+}+O^{2-}\rightarrow Fe_2O_3\)The products are H2O(l) and Fe(s). Therefore:
\(H_{2(g)}+Fe_2O_{3(g)}\rightarrow H_2O_{(l)}+Fe_{(s)}\)Reaction 3
Magnesium metal can be representd as Mg(s) and hydrochloric acid is HCl. Magnesium chloride will have the following formula:
\(Mg^{2+}+Cl^-\rightarrow MgCl_2\)Therefore, the equation can be writen as:
\(Mg_{(s)}+HCl_{(aq)}\rightarrow MgCl_{2(aq)}+H_{2(g)}\)Reaction 4
Magnesium sulfide has the following formula:
\(Mg^{2+}+S^{2-}\rightarrow MgS\)The reaction can be writen thus as:
\(MgS_{(s)}+HCl_{(aq)}\rightarrow H_2S_{(g)}+MgCl_{2(aq)}\)Reaction 5
Oxygen gas can be represented as O2(g) and solid copper as Cu(s). Copper (II) oxide has the following formula:
\(Cu^{2+}+O^{2-}\rightarrow CuO\)The reaction can be writen thus as:
\(O_{2(g)}+Cu_{(s)}\rightarrow CuO_{(s)}\)
two examples for liquid to liquid solution
Answers
Answer:
Some of liquid to liquid solutions examples are
milk+water solution buttermilk+water solution
oil+water
butter+water
alcohol+water
kerosene+water
petrol+water
mercury+water
Answer:
Examples for liquid in liquid solution:
1) Soda + Water
2) Alcohol + Water
3) Milk + Water
is pH used to classify compounds?
Answers
Answer:
The pH scale is used to rank solutions in terms of how acidic or how basic they are. It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution. ... This pH value of 7 is important because it indicates a neutral solution. All other substances are compared to this neutral point.
I hope I have helped :)
What type of intermolecular force will for between H2O AND CH3OH? Draw and label a picture of this bond. Explain in words how this bond forms.
Answers
Hydrogen bonding, which is unquestionably what we have, will occur from the intermolecular force between the molecules of H2O and CH3OH. Atoms trade or exchange valence electrons to create bonds.
How come we create bonds?Trust and self-esteem are developed in children and adolescents through strong emotional ties. After that, they can leave the family and establish wholesome friendships and other types of social ties. Healthy relationships consequently lower a child's chances of emotional discomfort or antisocial behaviour.
What exactly is a bonds, for example?The government of a country issues government bonds, a sort of fixed-interest bond. These bonds are thought of as low-risk investments. Examples of different kinds of government bonds include T - bills, Municipality Bond, Zero-Coupon Bonds, and others.
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In a cycle of copper experiment, a student first reacts a piece of copper metal with nitric acid to produce copper(II) nitrate (Cu(NO3)2) solution. The student then performs various reactions which transform the copper ions into a series of different copper compounds and complexes. Finally, the last reaction reduces the copper ions back to elemental copper metal. Copper atoms are conserved throughout the process. If the initial step of the experiment produces 4.12 mL of 2.41 M Cu(NO3)2, what is the theoretical yield of solid copper (Cu) that can be recovered at the end of the experiment
Answers
Answer:
0.631 grams is the theoretical yield of solid copper (Cu) that can be recovered at the end of the experiment
Explanation:
The concentration of the solution is given by :
\([C]=\frac{\text{Moles of compound}}{\text{Volume of solution in Liters}}\)
We have:
Concentration of copper (II) nitrate solution = \([Cu(NO_3)_2]=2.41 M\)
The volume of solution = 4.12 mL
1 mL= 0.001 L
\(4.12 mL= 4.12\times 0.001 L= 0.00412 L\)
Moles of copper (II) nitrate in solution = n
\(2.41=\frac{n}{0.00412 L}=0.0099292 mol\)
Moles of copper (II) nitrate in solution = 0.0099292 mol
1 Mole of copper(II) nitrate has 1 mole of copper then 0.0099292 moles of copper(II) nitrate will have :
\(1\times 0.0099292 mol= 0.0099292 \text{ mol of Cu}\)
Mass of 0.0099292 moles of copper:
\(=0.0099292 mol\times 63.55 g/mol=0.63100 g\approx 0.631 g\)
This mass of copper present in the solution is the theoretical mass of copper present in the given copper(II) nitrate solution.
0.631 grams is the theoretical yield of solid copper (Cu) that can be recovered at the end of the experiment
cyanate ion waste solution from gold-mining operations can be destroyed by treatment with hypochlorite ion in basic solution. Write a balanced oxidation-reduction equation for this reaction. OCN^-(aq) +OCl^-(aq) --> CO2^-(aq)+N2(g)+Cl^-(aq)+H2O(l)
Answers
The balanced oxidation-reduction equation for the destruction of cyanate ion waste solution from gold-mining operations by treatment with hypochlorite ion in basic solution is:
OCN⁻(aq) + OCl⁻(aq) + 2OH⁻(aq) → CO₂⁻(aq) + N₂(g) + Cl⁻(aq) + H₂O(l)
In this reaction, the cyanate ion (OCN⁻) is oxidized to carbon dioxide (CO₂⁻) and nitrogen gas (N₂), while the hypochlorite ion (OCl⁻) is reduced to chloride ion (Cl⁻). The reaction takes place in basic solution, which provides the hydroxide ions (OH⁻) needed to neutralize the acidic H⁺ ions produced during the oxidation of the cyanate ion.
The reaction is exothermic, releasing heat energy as the products form. This reaction is an effective way to dispose of the cyanate ion waste generated by gold-mining operations, as it converts the hazardous waste into harmless gases and ions.
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HELPPP PLEASEE w/ all
Answers
The covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.
What is covalent bond ?
Atoms share electron pair between them in covalent bonds. H-H or C-H are examples of nonpolar covalent bonds between atoms with similar or identical electronegativity, whereas polar covalent bonds are formed when unequal electronegativity is shared between atoms (e.g., H–O).
What is reactant ?
Raw materials known as reactants combine to create products. When the right factors, such as temperature, time, or pressure, come into play, the chemical bonds between the reactants are broken, allowing the atoms to form new bonds that lead to various combinations.
Therefore, covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.
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What does it mean for an object to be dense?
Answers
Answer: Density is a measure
Explanation: The more squashed together an object’s particles are, the denser it is.
Select the correct answer.
Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?
Answers
Answer:
Single-replacement reaction
Explanation:
Single-replacement reactions, aka. single-displacement reactions, involve one element/ion in a compound being replaced by another element/ion. In this case, aluminum is replacing the iron in the compound.
If you need help visualizing, the equation looks like this:
Fe₂O₃ + Al³⁺ --> Al₂O₃ + Fe³⁺
Identify the substance that has formula mass of 133.5amu.
(a) MgCI
b)SCI
c)BCI
D) AICI
Answers
The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.
To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.
(a) MgCl2:
The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).
Mg: atomic mass = 24.31 amu
Cl: atomic mass = 35.45 amu
Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu
(b) SCl:
The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).
S: atomic mass = 32.07 amu
Cl: atomic mass = 35.45 amu
Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu
(c) BCl:
The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).
B: atomic mass = 10.81 amu
Cl: atomic mass = 35.45 amu
Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu
(d) AlCl3:
The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).
Al: atomic mass = 26.98 amu
Cl: atomic mass = 35.45 amu
Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D
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balance by oxidation number method<br />KMnO4 + Na2O₂ + H2 so4 ko2so4 +<br />Mosou4 + Na2so<br />4 + O2 + H₂O
Answers
Answer:
8H2SO4 + 2KMnO4 + 5Na2O2 => 8H2O + 2MnSO4 + 5Na2SO4 + 5O2 + K2SO4
have:
Explanation:
The vapor pressure of liquid chloroform, CHCl3, is 400.0 torr at 24.1 °C and 100.0 torr at –6.3 °C. What is DeltaH of vaporization for chloroform?
Answers
Answer:
ΔH vaporization of chloroform is 30.1kJ/mol
Explanation:
It is possible to find ΔH of vaporization of certain compound knowing vapor pressure under 2 different absolute temperatures (In Kelvin) by using Clausius-Clapeyron equation:
\(ln\frac{P_2}{P_1}=\frac{DeltaHvap}{R} (\frac{1}{T_1} - \frac{1}{T_2} )\)
Where P is vapor pressure. R is gas constant (8.314J/molK) and T absolute temperature of 1, first state and 2, final state.
Absolute temperatures in the problem are:
T₁ = 24.1°C + 273.15 = 297.25K
T₂ = -6.3°C + 273.15 = 266.85K
Replacing:
\(ln\frac{P_2}{P_1}=\frac{DeltaHvap}{R} (\frac{1}{T_1} - \frac{1}{T_2} )\)
\(ln\frac{100torr}{400.0torr}=\frac{DeltaHvap}{8.314J/molK} (\frac{1}{297.25K} - \frac{1}{266.85K} )\)
\(ln\frac{100torr}{400.0torr}={DeltaHvap}* -4.6x10^{-5}mol/J\)
30073J/mol = 30.1kJ/mol = ΔHVap
ΔH vaporization of chloroform is 30.1kJ/molA. Iodine
B. Gold
C. Magnesium
D. Potassium
Answers
Answer:
A, Iodine
Explanation:
It exists, sodiumiodine.
What happens if i don’t pass the chemistry regent?
Answers
Answer:
You will typically get another chance to retake the exam
Answer:
well you either have a chance to retake the test if your teacher or just not let you take it at all. you have to pass 4 regents test including chemistry in order to get a regent diploma. so you can either retake or it you just failed it.
How many moles are in 3.5 x 10^24 molecules of methane gas?
Please show work, will give brainliest
Answers
Answer:
5.81 moles
Explanation:
To find the number of moles (n) in 3.5 x 10²⁴ molecules of methane gas, we divide the number of molecules by Avagadro's number (nA). That is,
n = number of molecules ÷ 6.02 × 10²³
According to this question, 3.5 x 10^24 molecules of methane gas was given, hence,
n = 3.5 × 10²⁴ ÷ 6.02 × 10²³
n = 3.5/6.02 × 10(24 - 23)
n = 0.5814 × 10¹
n = 5.81 moles
Which diagram represents an element that is likely to form covalent bonds? A purple circle with 2 concentric circles around it. The inner circle has 2 small green spheres. The outer circle has 1 small green sphere. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 5 small green spheres. A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 8 small green spheres.
Answers
Diagram represents an element that is likely to form covalent bonds is a purple circle with 3 concentric circles around it
Covalent bond means it consist of mutual sharing of one or more pair of electron between two atom and covalent bond diagram consist of in the middle the small circle which is purple color and three concentric circles around the purple circle and covalent bond diagram show the electron dot formulas and they often reffred to as lewis structure and are little different than electron dot formula used to represent the ionic bond
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a category of classification below a kingdom? A phylum B domain C species
Answers
Answer:
Phylum
Explanation:
After that it goes class, order, family, genus, and finally species. In that order, BTW before kingdom is domain.
Answer:
Phylum
Explanation:
What is the position of the earth, moon, and sun during a new moon?
Answers
Answer:
In the case of a New Moon, the Moon is between Earth and the Sun, so the side of the Moon facing the Sun isn't facing us. We can't see any portion of the lit-up Moon during this phase. (When the Sun and Moon exactly line up, as viewed from Earth, we get a special experience known as a solar eclipse
Explanation:
good luck hope this helps
8. An ion with 5 protons, 6 neutrons, and a charge of 3+ has an
atomic number of
a) 5
b) 6
c) 8
d) 11
Answers
Atomic number = The number of proton in an atom or ion so the right answer is 5!
What mass (grams) of antimony(III) chloride would be produced by reacting with 112 liters of chlorine measured at STP?
Answers
Answer:
radius = 16 in ; height = 27 in
A sample of polonium-210 has an initial mass of 390 milligrams (mg). If the half-life of polonium-210 is 36 days, how many mg of the sample remains after 36 days?
A.
48.75 mg
B.
392 mg
C.
97.5 mg
D.
195 mg
Answers
Answer:
d
Explanation:
What ion causes hardness of water?
Answers
Answer:
calcium ions
Explanation:
Water hardness is due to the presence of calcium ions, and to a lesser extent, magnesium, iron, and manganese.
Select the correct terms to complete this statement about charged particles.
Like charges attract | repel, and opposite charges attract repel. According to Coulomb's law, as the distance between two charged particles decreases, the force between the particles decreases I increases. As the magnitude of the charges decreases, the force decreases | increases.
Answers
Like charges repel each other, while opposite charges attract each other. This principle is one of the fundamental aspects of electrostatics. According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
As the distance between two charged particles decreases, the force between them increases. This is because the closer the particles are, the stronger the electric field they create, leading to a stronger force of interaction.
On the other hand, as the magnitude of the charges decreases, the force between the particles also decreases. This is because the force is directly proportional to the product of the charges. If one or both of the charges are smaller, the force they exert on each other will be weaker.
In summary, according to Coulomb's law, decreasing the distance between charged particles increases the force between them, while decreasing the magnitude of the charges decreases the force. This understanding of the relationship between charge, distance, and force is crucial in explaining the behavior of charged particles and the interactions between them.
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