Free Printable R. Chem - Stoich Test Corrections

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R. Chem - Stoich Test Corrections

Total questions: 25

Worksheet time: 45mins

Name

Class

Date

The term 'mole' is used to represent:

the density of particles

a specific kind of particle

a number of particles

the reactivity of particles

One mole of O₂ and one mole of Na both have the same:

formula mass

volume

number of particles

number of electrons

The mass of one mole of any element or compound is derived from:

the atomic number of the element or compound

the formula mass of the element or compound

the volume of the element or compound

the density of the element or compound

What is the correct name for the compound, CaSO₄•2H₂O?

carbon sulfate dihydrate

calcium sulfur oxide dihydrate

calcium sulfide dihydrate

calcium sulfate dihydrate

What is the correct name for the compound, Ba(OH)₂•8H₂O?

barium dihydroxide octahydrate

barium hydroxide octahydrate

barium hydroxide hydrate

boron hydroxide octahydrate

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

What is the percent by mass of fluorine in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

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)

10.

Where are the numbers for a mole ratio found?

They are part of the chemical formulas for the reactants / products.

They are given in the problem.

They are found on the periodic table for those elements.

They are found as coefficients in the reaction's balanced chemical equation.

11.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

12.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?

4 mol H₂O

6 mol H₂O

24 mol H₂O

96 mol H₂O

384 mol H₂O

13.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: If 3.5 moles of oxygen gas are used up as ethane combusts completely, how many moles of carbon dioxide are produced?

0.5 mol CO₂

0.57 mol CO₂

2.0 mol CO₂

3.0 mol CO₂

3.5 mol CO₂

14.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: How many moles of ethane (C₂H₆) are required to produce 13.5 moles of water from the above reaction?

4.5 mol C₂H₆

27 mol C₂H₆

40.5 mol C₂H₆

81 mol C₂H₆

162 mol C₂H₆

15.

Molar mass is in units of ________.

grams

grams/mole

mole

moles/gram

16.

What is the molar mass of AuCl₃?

96 g

130 g

232.5 g

303.3 g

17.

Which would have more atoms?

1 mole of Li

1 mole of Au

1 mole of Si

None, all are equal

18.

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

19.

What is the mass in grams of 5.90 mol C₈H_18?

.0512 g

19.4 g

673 g

389 g

20.

How many moles are in 19.82 g Mg?

1.226mol Mg

481.7mol Mg

1.000mol Mg

0.8156 mol Mg

21.

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

431.22 grams

6.02 grams

207.2 grams

486.01 grams

22.

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

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

23.

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696g.

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

24.

How many moles of oxygen are in one mole of Fe₂O₃?

25.

How many moles of oxygen are in Al₂(SO₃)₃

100 %

R. Chem - Stoich Test Corrections

Total questions: 25

Worksheet time: 45mins

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