Free Printable 3EXP Mole Concept & Stoichiometry

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3EXP Mole Concept & Stoichiometry

Total questions: 25

Worksheet time: 1hrs 26mins

Name

Class

Date

A mole of Neon contains
6.02 x 10²³_____.

atoms

formula units

ions

molecules

If the number of atoms present in 10 g of calcium is x, what is the number of atoms in 14 g of nitrogen gas?

0.5 x

A mole of carbon dioxide contains 6.02 x 10²³_____.

atoms

formula units

ions

molecules

Which of the following contains the least number of atoms?

1 mol of ammonia (NH₃)

1 mol of hydrogen (H₂)

1 mol of sulfur dioxide (SO₂)

1 mol of zinc (Zn)

What percentage of the total atomic mass of lithium phosphide (Li₃P) is composed of phosphorus?

13%

29%

40%

60%

Find the percentage composition of Mg in Mg₃(PO₄)₂.

27.48% Mg

43.11% Mg

16.00% Mg

12.63% Mg

Using the following equation:
4 NH₃ + 5 O₂ $\rightarrow$ 4 NO + 6 H₂O
How many grams of oxygen gas are needed to react with 56.8 grams of ammonia (NH3)?

45.08 g O₂

133.33 g O₂

260.77 g O₂

75.92 g O₂

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

6.7 mol

1.0 mol

10.1 mol

4.5 mol

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)
12.00 moles of NaClO₃ will produce how many grams of O₂?

256 g of O₂

576 g of O₂

288 g O₂

10.

Cl₂ + 2KBr → Br₂ + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

749 g

223 g

479 g

814 g

11.

Fe₂O₃ + 3H₂ → 2Fe + 3H₂O
About how many grams of H₂O will be produced from 150 grams of Fe₂O₃?

50 grams H₂O

60 grams H₂O

5000 grams H₂O

6000 grams H₂O

12.

4NH₃+ 5O₂→ 4NO + 6H₂O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?

0.37g

0.045g

1.35g

11.1g

13.

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl₂.

Mg + 2 HCl $\rightarrow$ MgCl₂ + H₂

H₂

MgCl₂

HCl

14.

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?
1 C₁₀H₈ + 12 O₂ $\rightarrow$ 10 CO₂ + 4 H₂O

Oxygen

C₁₀H₈

Water

Carbon Dioxide

15.

4NH₃+ 5O₂--> 4NO + 6H₂O

If 1.21 g of NO are formed when 6.30 g of ammonia react with 1.80 g of oxygen, what is the % yield?

37.0 %

45.1 %

89.6%

10.9 %

16.

The reaction of 25.0 g benzene, C₆H₆, with excess HNO₃ resulted in 21.4 g C₆H₅NO₂. What is the percentage yield?

C₆H₆ + HNO₃ → C₆H₅NO₂ + H₂O

100%

27.39%

54.29%

85.62%

17.

What is the molar concentration of 4.0 g of NaCl in 3,800 cm³ of solution?

0.018 mol/dm³

0.001 mol/dm³

1.052 mol/dm³

0.062 mol/dm³

18.

50.0 cm³ of phosphoric acid is titrated with 25.0 cm³ 0.1 mol/dm³ sodium hydroxide solution. The reaction is as follows :

H₃PO₄+ 3NaOH → Na₃PO₄ + 3H₂O

Calculate the molar concentration of H₃PO₄ acid.

0.017 mol/dm³

0.67 mol/dm³

1.5 mol/dm³

6.0 mol/dm³

19.

Based on the following reaction, what is the volume of NH₃ that is needed to react completely with 30.0 dm³ of NO?
4NH₃ + 6NO $\rightarrow$ 5N₂ + 6H₂O

5.0 dm³

20.0 dm³

7.5 dm³

120.0 dm³

20.

C₂H₂ undergoes combustion to produce carbon dioxide and water vapour.

2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

If 0.75 dm³ CO₂ is produced, what volume of C₂H₂ are required?

0.900 dm³

0.938 dm³

0.405 dm³

0.375 dm³

21.

Ethane (C₂H₆) undergoes combustion to produce carbon dioxide and water vapour.

2C₂H₆ + 7O₂ $\rightarrow$ 4CO₂ + 6H₂O

3 g of ethane and 10.2 dm³ oxygen were ignited in a reaction vessel. What is the final volume of gases present in the vessel?

4.80 dm³

6.60 dm³

12.1 dm³

13.8 dm³

22.

A mixture contains aluminium chloride, magnesium chloride and magnesium sulfate. 19.2 g of sulfate ions, 9.6 g of magnesium and 35.5 g of chloride ions were present in it.

How many moles of aluminium ions were present in the mixture?

0.100 mol

0.200 mol

0.300 mol

0.400 mol

23.

Pure magnesium can be extracted from a magnesium ore called magnesite (MGCO₃). During the process, magnesite is first decomposed to form magnesium oxide.

MgCO₃ $\rightarrow$ MgO + CO₂

Silicon is then added into the magnesium oxide obtained to produce magnesium.

Si + 2MgO $\rightarrow$ 2Mg + SiO₂

What is the percentage purity of magnesite if 250 tonnes of magnesite produce 64 tonnes of magnesium?

$\frac{\frac{64\times84}{24}\times100}{250}\%$

$\frac{\frac{64\times84}{40}\times100}{250}\%$

$\frac{\frac{64\times84}{24}\times100}{250\times2}\%$

$\frac{\frac{64\times84}{24}\times250}{100}\%$

24.

CuCl₂ + 2NaNO₃ $\rightarrow$ Cu(NO₃)₂ + 2NaCl

If 15.0 grams of CuCl₂ react with 20 g of NaNO₃, How much of the excess reactant is left over in this reaction?

0.9 g of sodium nitrate

34 g of sodium nitrate

16 g of copper(II) chloride

16 g of sodium nitrate

25.

3CaCO₃ + 2FePO₄ $\rightarrow$ Ca₃(PO₄)₂ + Fe₂(CO₃)₃

Assuming we start with 100 g of CaCO₃ and 45 g of FePO₄, What is the maximum amount of each product that can be formed?

85 g of calcium carbonate, 39 g of iron(III) phosphate

12.4 g of calcium phosphate, 27 g of iron(III) carbonate

37.2 g of calcium phosphate, 29.3 g of iron(III) carbonate

46.3 g of calcium phosphate, 43.8 g of iron(III) carbonate

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3EXP Mole Concept & Stoichiometry

Total questions: 25

Worksheet time: 1hrs 26mins

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