A mass of a gas occupies 840cm cube at 750mm pressure, what volume would it occupy at 780mm pressure​

The volume of this same sample of gas if it were measured at STP is 386.09mL

HOW TO CALCULATE VOLUME:

The new volume of a gas sample can be calculated using the following expression:

P1V1/T1 = P2V2/T2

Where;

According to this question, a sample of a certain gas has a volume of 452 mL at 711 mmHg and 26°C (299K).

(711 × 452)/299 = 760 × V2/273

1074.82 = 2.78V2

V2 = 1074.82 ÷ 2.78

V2 = 386.09mL

Therefore, the volume of this same sample of gas if it were measured at STP is 386.09mL.

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The silver ion is precipitated using the chloride ion as the precipitating substance. NaCl in solution would also function because it contains the chloride molecule in solution.

For instance, solid silver chloride can be produced by precipitating silver ions with hydrochloric solution. This straightforward reaction can be used to separate ions that form insoluble chlorides from those that do not because many cations will not react with hydrochloric acid in this manner. By precipitating AgCl with NaCl as a precipitant, we can measure Ag+ by gravimetry. If this is the only reaction we take into account, then we anticipate that the solubility of the precipitate, SAgCl, is given by the equation below.When we compare the amounts of Cl- needed to precipitate each salt, we can see that as Cl- is introduced to the solution, AgCl will precipitate first because it needs a lot less Cl-. As a result, Ag+ and Pb2+ can be isolated from one another by gradually adding Cl- until [Cl-] is between 1.8 and 2.9 M.

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Answer:

The change in smell

Explanation:

chemical reactions ccan lead to change in temperature, change in color and also change in smell

Answer:

It's a liquid

Explanation:

The (l) is one of the four state symbols. You also have (s) for solid, (g) for gas and (aq) for aqueous - something in a solution. Hope this helps!!

Answer:

liquid

Explanation:

the scientific symbol of liquid is represented by l

The spheres of Earth that are directly influenced when human-caused air pollution leads to acid rain that dissolves limestone rocks are the geosphere, atmosphere, and hydrosphere.

Acid rain is formed when pollutants such as sulfur dioxide and nitrogen oxides react with water vapor in the atmosphere, forming sulfuric and nitric acid. These acids then fall to the ground in the form of rain or other precipitation. When acid rain falls on limestone rocks, which are part of the geosphere, it causes them to dissolve and erode over time. This process is known as chemical weathering and can lead to the formation of sinkholes and other geological features.

The dissolved limestone can also enter the hydrosphere, affecting the quality of water in rivers, lakes, and other bodies of water. In addition, acid rain can have negative impacts on the atmosphere, such as contributing to the formation of smog and harming vegetation in the biosphere.

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The following which is not a part of  Dalton atomic theory is the properties of atoms of the same elements can be different . Thus option B is correct.

Dalton has proposed his theory in three parts and each part stated that

The first portion of his theory asserts that all stuff is made up of indivisible atoms.

According to the second section of the theory, all atoms of a given element have the same mass and characteristics.

Compounds, according to the third section, are combinations of two or more different types of atoms.

Dalton has given three laws

Thus, the following which is not a part of  Dalton atomic theory is the properties of atoms of the same elements can be different . Thus option B is correct.

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Your question is incomplete, but your complete question was

which of the following is not a part of the ideas john dalton proposed in his model

A. All matter is composed of indivisible atoms.

B. The properties of atoms of the same element can be different.

C. Compounds form when atoms combine in whole number ratios.

D. An atom can neither be created nor destroyed.

Molar mass is the ratio of the mass to that amount of the substance. The mass of the barium nitrate in the formula unit is 23.0 grams.

The mass of a substance is the product of the molar mass of the compound and the number of moles of the compound.

Given,

Molar mass of barium nitrate = 261.35 g/mol

If, \(6.022 \times 10^{23}\) have a mass of 261.35 g/mol then, \(5.30 \times 10^{22}\) formula units will have a mass of,

\(\begin{aligned}& = \dfrac{261.35 \times 5.30 \times 10^{22}}{6.022\times 10^{23}}\\\\&= 23.0\;\rm gm\end{aligned}\)

Therefore, option C. 23.0 gm is the mass of barium nitrate.

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Answer:

Explanation:

23.0g

The both compounds are different because their percentage compositions are different.

In order to confirm  that weather both compounds are same or not we will check the mole ratio. If it is same the compounds will be same otherwise not..

Given that,

For compound 1,

Mass of hydrogen given as 15 g

Mass of oxygen given as120 g

Moles of hydrogen and oxygen are to be determined

Number of moles of hydrogen = 15 g/ 1g/mol = 15 mol

Number of moles of oxygen = 120 g/ 16 g/mol = 7.5 mol

Total no of moles = 22.5 mol

Percentage of hydrogen = 15 /22.5 × 100 = 66.7%

Percentage of oxygen = 7.5 / 22.5× 100 = 33.3%

For  the compound 2,

Mass of hydrogen is 2 g

Mass of oxygen is 32 g

Moles of hydrogen and oxygen = ?

No of moles of hydrogen = 2 g/ 1g/mol = 2 mol

No of moles of oxygen = 32 g/ 16 g/mol = 2 mol

Total number of moles = 4 mol

Percentage of hydrogen = 2 /4 × 100 = 50%

Percentage of oxygen = 2 / 4× 100 = 50%

So, the both compounds will be different having different percentage compositions.

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A biodiverse environment, one with many distinct species, is frequently more adaptable to changing conditions and can endure major shocks. Each species has a distinct purpose in the coral reef ecosystem.

Better biodiversity contributes to greater stability in ecosystems, animals, and individuals. Species with significant genetic diversity and diverse populations that are adapted to a wide range of environments, for example, are more likely to withstand disturbances, illness, and climate change.

Biodiversity, also known as biological diversity, refers to the variety and variability of life on Earth. Biodiversity is a measure of genetic, species, and ecological variation.

Soil fertilization, nutrient recycling, pest and disease controls, erosion control, and crop and tree pollination are all provided by biodiversity.

High biodiversity is preferable to low biodiversity because high biodiversity ecosystems are better equipped to maintain equilibrium and be productive.

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Answer: only for the equation.

2KNO3->2KNO2+O2

Explanation:

Answer:

37.84 Liters

Explanation:

(see picture)

acidic in naturenature

Generally, Oxides of non-metals are acidic in nature. When non-metals are reacted with water it forms an acidic solution. The common oxides of Sulphur, Selenium, and Bromine are strongly acidic.

Answer: The percent yield of zinc carbonate is 5.91 %

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)

 \(\text{Moles of} ZnCO_3=\frac{12.6 g}{125.4g/mol}=0.100moles\)

\(ZnI_2\) is the limiting reagent as it limits the formation of product and \(Na_2CO_3\) is the excess reagent.  

\(Na_2CO_3+ZnI_2\rightarrow 2NaI+ZnCO_3\)  

According to stoichiometry :

1 mole of produce =  1 mole of

Thus 1.7 moles of \(ZnI_2\) will produce=\(\frac{1}{1}\times 1.7=1.7moles\)  of \(ZnCO_3\)

Theoretical yield of \(ZnCO_3=moles\times {\text {Molar mass}}=1.7moles\times 125.4g/mol=213.2g\)

percentage yield = \(\frac{\text {Experimental yield}}{\text {Theoretical yield}}\times 100=\frac{12.6g}{213.2g}\times 100=5.91\%\)

Answer:

the other person was right EXCEPT it says in 2 significant numbers so the answer is 5.9

Explanation:

i hope this helps. have a wonderful day :))

The amount of money that you can make from the sale in US dollars would be = $126.1

The volume of the small gold bar = 40.50 cm3

The density of the gold = 19.31 g/cm3

Therefore the mass

= volume/density

= 40.50/19.31

= 2.1 g

But ; 1 g = 49.84 British pounds

2.1 g = X

Make X the subject of formula;

X = 2.1× 49.84

= 104.66 British pounds

But, 1 US$=0.83 British pounds

X US$ = 104.66 British pounds

make X the subject of formula;

X = 104.66/0.83

X = $126.1

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Answer:

The paper no longer has smooth edges

The paper has not produced gas when torn

The paper has not changed colours

The paper is still paper with the same chemical makeup

The material is gold.

The specific heat capacity, also known as simply specific heat, is the amount of heat energy required to raise the temperature of a substance by one unit, usually per unit of mass. It is typically denoted by the symbol "c" and has units of J/kg°C (joules per kilogram per degree Celsius) or J/mol°C (joules per mole per degree Celsius).

H = mc dT

m = mass

c = specific heat capacity

dT = temperature change

c = H/mdT

c = 0.5 * 10^3/100 (63.5 - 25)

c = 0.126

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Taking into account the definition of Avogadro's Number, 10.365 moles of H₂O are 6.243×10²⁴ molecules of H₂O.

Avogadro's Numberis called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance.

Its value is 6.023×10²³ particles per mole and it applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of H₂O, then 6.243×10²⁴ molecules are contained in how many moles of H₂O?

amount of moles of H₂O= (6.243×10²⁴ molecules× 1 mole)÷ 6.023×10²³ molecules

amount of moles of H₂O= 10.365 moles

Finally, 10.365 moles of H₂O are 6.243×10²⁴ molecules of H₂O.

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Answer:0.87

Explanation:

In the case of magnesium, its position in the periodic table and its electron configuration strongly suggest the formation of the\(Mg2^+\) cation as the most stable ion.

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If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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The final volume of the reconstituted cefazolin solution is 4 mL.  The volume of the cefazolin powder is 0.6 mL. The final volume of the 100 mg/mL cefazolin solution is 10 mL.

The packaging insert instructs to add 3.4 mL of sterile water without bacteriostat to the 1-g vial of cefazolin. This results in a reconstituted solution with a concentration of 250 mg/mL.

To find the final volume, we can set up the equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (250 mg/mL) and the amount of drug (1 g = 1000 mg), we can rearrange the equation to find the final volume:

250 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 250 mg/mL = 4 mL

Therefore, the final volume of the reconstituted cefazolin solution is 4 mL.

To find the volume of the cefazolin powder, we need to subtract the volume of sterile water added from the final volume of the reconstituted solution.

Given that 3.4 mL of sterile water is added to the vial, and the final volume of the reconstituted solution is 4 mL, we can calculate the volume of the cefazolin powder as follows:

Volume of cefazolin powder = Final volume - Volume of sterile water added

Volume of cefazolin powder = 4 mL - 3.4 mL = 0.6 mL

Therefore, the volume of the cefazolin powder is 0.6 mL.

To determine the final volume of the 100 mg/mL cefazolin solution, we can use the concentration and the amount of drug.

We are given that the resulting concentration after reconstitution should be 100 mg/mL. Considering the amount of drug is 1 g (1000 mg), we can set up the following equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (100 mg/mL) and the amount of drug (1000 mg), we can rearrange the equation to find the final volume:

100 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 100 mg/mL

Final volume = 10 mL

Therefore, the final volume of the 100 mg/mL cefazolin solution is 10 mL.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

Molarity of a solution = 1 mol / L

Explanation:

Given:

Amount of NaOH =20 g

Amount of water = 0.50 l

Find:

Molarity of a solution

Computation:

1 mol of NaOH = 40 g

So,

Moles of NaOH = 20 / 40 g = 0.50 mol NaOH

Molarity of a solution = moles of solute / Liters of solution

Molarity of a solution = 0.50 / 0.50

Molarity of a solution = 1 mol / L

The ratio of concentrations of the axial and equatorial conformations of isopropylcyclohexane at 25 °C is approximately 8.3:1.

The standard free-energy difference between the two chair conformations of isopropylcyclohexane is 9.2 kJ mol⁻¹ (2.2 kcal mol⁻¹). This energy difference reflects the stability of the conformations and provides insight into their relative concentrations. The equilibrium constant, K, for the interconversion of the two chair conformations can be calculated using the equation ΔG = -RT ln K, where R is the gas constant and T is the temperature in Kelvin.

At 25 °C (298 K), we can rearrange the equation to solve for ln K: ln K = -ΔG/(RT). Substituting the given values, ln K = -(9200 J mol⁻¹)/(8.314 J K⁻¹ mol⁻¹) (298 K) = -3.663.

To obtain the ratio of concentrations, we can use the relationship between the equilibrium constant and the ratio of concentrations:

K = [concentration of axial conformation]/[concentration of equatorial conformation].

Taking the exponential of both sides of the equation, we have \(e^(ln K) = e^(-3.663)\), which simplifies to K = 0.0264. Therefore, the ratio of concentrations is approximately 0.0264:1 or 8.3:1, indicating that the axial conformation is present in higher concentration compared to the equatorial conformation.

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Most likely, exothermic processes are what cause the light that fireflies emit. because fuel and oxygen undergo a chemical process that produces carbon dioxide and water.

In thermochemistry, an exothermic process is one "for which the overall standard enthalpy change H is negative." Exothermic processes typically result in heat. A reaction for which the overall standard Gibbs energy change G is negative is what the term "reaction" according to the IUPAC means.

The exergonic response and the phrase are commonly mistaken. A very exothermic reaction will often accompany an exergonic reaction since "H" significantly contributes to "G." The majority of the remarkable chemical reactions presented in classrooms are exothermic and exergonic processes.

On the other hand, an endothermic reaction typically produces heat and is brought on by a rise in the entropy of the system.

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