Physical Chemistry 1: Amount of substance multiple choice questions

1. How many molecules are in 15.0 g of PH₃?
(Avogadro’s number is 6.022 x 10²³)

2.66 x 10²³

2.65 x 10²³

1.36 x 10²⁴

1.37 x 10²⁴

Correct! Wrong!

2. What is the molar mass of an oxygen atom?

8

16

32

64

Correct! Wrong!

3. The density of pure water is 1000 g dm^-3.
What is the molarity of pure water?

1 mol dm^-3

56 mol dm^-3

32 mol dm^-3

18 mol dm^-3

Correct! Wrong!

4. Calculate the mass of KOH that should be dissolved in 500 cm³ water to give a solution with a concentration of 0.600 mol dm^-3

0.0673 g

187 g

0.300 g

16.8 g

Correct! Wrong!

5. A 1 dm³ sample of Noble gas X contains 0.04471 moles. The density of the gas is 1.784 g dm^-3.
Which gas does the sample contain?

Helium

Neon

Argon

Krypton

Correct! Wrong!

6. Calculate the concentration of the solution that is formed by adding 50 cm³ of water to 25 cm³ of 0.268 mol dm^-3 HCl

0.134 mol dm^-3

0.0893 mol dm^-3

1.24 mol dm^-3

3.35 x 10-4 mol dm^-3

Correct! Wrong!

7. 0.05 moles of an Iron salt FeCl_x reacts with AgNO₃to form 21.5 g of AgCl. What is the value of x?

1

2

3

4

Correct! Wrong!

8. A The uncertainty of a balance is + 0.1g.
What is the % uncertainty if this balance is used to measure 26.7 g of CuSO₄?

0.4%

0.1%

0.004%

0.003%

Correct! Wrong!

9. What is the formula of Iron(II) Carbonate?

Fe₃(CO₃)₂

FeCO₃

Fe₂(CO₃)₃

FeCO₂

Correct! Wrong!

10. Dinitrogen Monoxide decomposes to produce Nitrogen and Oxygen according to the following equation:

2N₂O(g) → 2N²(g) + O₂(g)

Assuming a constant temperature, how many times greater is the volume of the products than the volume of the reactants?

5

0.67

1.5

10

Correct! Wrong!

Gemma Shearer

Physical Chemistry 1: Amount of substance multiple choice questions

1. How many molecules are in 15.0 g of PH₃?
(Avogadro’s number is 6.022 x 10²³)

2. What is the molar mass of an oxygen atom?

3. The density of pure water is 1000 g dm^-3.
What is the molarity of pure water?

4. Calculate the mass of KOH that should be dissolved in 500 cm³ water to give a solution with a concentration of 0.600 mol dm^-3

5. A 1 dm³ sample of Noble gas X contains 0.04471 moles. The density of the gas is 1.784 g dm^-3.
Which gas does the sample contain?

6. Calculate the concentration of the solution that is formed by adding 50 cm³ of water to 25 cm³ of 0.268 mol dm^-3 HCl

7. 0.05 moles of an Iron salt FeCl_x reacts with AgNO₃to form 21.5 g of AgCl. What is the value of x?

8. A The uncertainty of a balance is + 0.1g.
What is the % uncertainty if this balance is used to measure 26.7 g of CuSO₄?

9. What is the formula of Iron(II) Carbonate?

10. Dinitrogen Monoxide decomposes to produce Nitrogen and Oxygen according to the following equation:

2N₂O(g) → 2N²(g) + O₂(g)

Assuming a constant temperature, how many times greater is the volume of the products than the volume of the reactants?

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1. How many molecules are in 15.0 g of PH3? (Avogadro’s number is 6.022 x 1023)

2. What is the molar mass of an oxygen atom?

3. The density of pure water is 1000 g dm-3. What is the molarity of pure water?

4. Calculate the mass of KOH that should be dissolved in 500 cm3 water to give a solution with a concentration of 0.600 mol dm-3

5. A 1 dm3 sample of Noble gas X contains 0.04471 moles. The density of the gas is 1.784 g dm-3. Which gas does the sample contain?

6. Calculate the concentration of the solution that is formed by adding 50 cm3 of water to 25 cm3 of 0.268 mol dm-3 HCl

7. 0.05 moles of an Iron salt FeClx reacts with AgNO3to form 21.5 g of AgCl. What is the value of x?

8. A The uncertainty of a balance is + 0.1g. What is the % uncertainty if this balance is used to measure 26.7 g of CuSO4?

9. What is the formula of Iron(II) Carbonate?

10. Dinitrogen Monoxide decomposes to produce Nitrogen and Oxygen according to the following equation: 2N2O(g) → 2N2(g) + O2(g) Assuming a constant temperature, how many times greater is the volume of the products than the volume of the reactants?

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1. How many molecules are in 15.0 g of PH₃?
(Avogadro’s number is 6.022 x 10²³)

3. The density of pure water is 1000 g dm^-3.
What is the molarity of pure water?

4. Calculate the mass of KOH that should be dissolved in 500 cm³ water to give a solution with a concentration of 0.600 mol dm^-3

5. A 1 dm³ sample of Noble gas X contains 0.04471 moles. The density of the gas is 1.784 g dm^-3.
Which gas does the sample contain?

6. Calculate the concentration of the solution that is formed by adding 50 cm³ of water to 25 cm³ of 0.268 mol dm^-3 HCl

7. 0.05 moles of an Iron salt FeCl_x reacts with AgNO₃to form 21.5 g of AgCl. What is the value of x?

8. A The uncertainty of a balance is + 0.1g.
What is the % uncertainty if this balance is used to measure 26.7 g of CuSO₄?

10. Dinitrogen Monoxide decomposes to produce Nitrogen and Oxygen according to the following equation:

2N₂O(g) → 2N²(g) + O₂(g)

Assuming a constant temperature, how many times greater is the volume of the products than the volume of the reactants?