Free Printable topic 5 stoichiometry

Worksheets

topic 5 stoichiometry

Total questions: 40

Worksheet time: 3hrs 6mins

Name

Class

Date

N₂ + 3 H₂ → 2 NH₃

How many moles of NH₃ will be formed from 1 mole of H₂?

0.4 moles

0.67 moles

1.5 moles

6 moles

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

4 moles Fe

6 moles Fe

9 moles Fe

2 moles Fe

N₂ + 3H₂ → 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

How many moles are in 40. g of CaCO₃? (MM = 100.09 g/mol)

0.40 mol

16 mol

2.5 mol

4.0 mol

2Na + S -->Na₂S
What is the total number of moles of S that reacts when 4.0 moles of Na were completely consumed?

0.5

Where can you find the mole ratio?

Coefficients in a balanced equation

On the Periodic Table

From my teacher

You can't find it

What is the molar mass of CH₄

16.05

12.04

15.03

17.02

What is the molar mass of Mg(NO₃)₂

148.313g/mol

134.306g/mol

54.311g/mol

Calculate the molar mass of Mg(OH)_2.

33.2 g/mol

41.3 g/mol

86.9 g/mol

58.3 g/mol

10.

What is the molar mass of CF₄?

11.

What is the molar mass of (NH₄)₂CO₃ ?

144 g

138 g

96 g

78 g

12.

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

13.

What percent of Zn₃(PO₄)₂ is zinc?

33.15%

16.04%

50.81%

19.68%

14.

Which list of number for the atoms in Mg(NO₃)₂ is right?

Mg = 1, N = 6, O = 6

Mg = 1, N = 6, O = 2

Mg = 2, N = 2, O = 6

Mg = 1, N = 2, O = 6

15.

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

16.

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

C₂H₅

C₄H₁₀

C₁H_2.5

C₄H₈

17.

Mole ratios are obtained from the

balanced chemical equation

periodic table

molar mass

18.

What is the molar mass of C₆H₁₂O₆?

180.18

180.12

180.24

180.06

19.

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

256 g of O₂

576 g of O₂

288 g O₂

20.

Balance the following reaction :

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

1,2,2,2

1,2,1,1

2,1,1,1

2,1,2,1

21.

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

22.

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

23.

In which compound is the percent composition by mass of Cl equal to 42%?

HClO (gram formula mass = 52 g/mol)

HClO₂ (gram formula mass = 68 g/mol)

HClO₃ (gram formula mass = 84 g/mol)

HClO₄ (gram formula mass = 100 g/mol)

24.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

25.

Which of the following is considered an empirical formula?

CH₃COOH

C₆H₁₂O₆

H₂O

26.

What is the percentage of oxygen in carbon dioxide? (CO2)

27.3%

72.7%

30%

70%

27.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO2

SO3

SO4

28.

A formula with the lowest whole # ratio of elements in a compound is called

Molecular Formula

Chemical Formula

Empirical Formula

Distance Formula

29.

What is the little number after an element in a chemical equation called.
Example: H₂

Coefficient

Subscript

Atom

Equation

30.

Avogadro’s number is:

6.02 x 10²²

6.02 x 10²³

3.01 x 10²³

31.

What is the mass in grams of 5.90 mol C₈H_18?

.0512 g

19.4 g

673 g

389 g

32.

How many moles are in 19.82 g Mg?

1.226mol Mg

481.7mol Mg

1.000mol Mg

0.8156 mol Mg

33.

What is the mass in grams of 2.3456 moles of W?

431.22 grams

6.02 grams

207.2 grams

486.01 grams

34.

How many moles are in 1459 grams of Na?

63.46 moles

60.36 moles

10 moles

1 mole

35.

How many grams are in 0.523 mol of AlPO₄?

63.78 g

38.68 g

47.23 g

55.43 g

36.

A baker needs 6 g of baking soda for a recipe. The chemical formula for baking soda is NaHCO₃. How many moles of baking soda is needed?

0.071 mol

0.167 mol

0.273 mol

0.214 mol

37.

How many moles are in 16.94g of water?

16.94 mol H₂O

0.9401 mol H₂O

305.3 mol H₂O

1.063 mol H₂O

38.

Find the mass of 11.37 mol of BaO. Round to the nearest whole number.

1,354 g

1,740 g

17.40 g

1,684 g

39.

Determine the number of moles of AlNO₃ that are in 264 g of the compound.

2.97 mol

3.45 mol

2.73 mol

1.86 mol

40.

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

3.2 mol

1.7 mol

2.1 mol

1.9 mol

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topic 5 stoichiometry

Total questions: 40

Worksheet time: 3hrs 6mins

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