Free Printable Mole Practice Quiz Part 2 (% comp. EFMF, hydrates)

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Mole Practice Quiz Part 2 (% comp. EFMF, hydrates)

Total questions: 25

Worksheet time: 2hrs 45mins

Name

Class

Date

Ca(NO₃)_{2
What is the % composition of Ca?}

24.4%

20.4%

17.1%

58.5%

Ca(NO₃)2
What is the % composition of O?

24.4%

17.1%

20.1%

58.5%

CaCl₂
What is the % composition of Cl?

24.5%

75.5%

36.1%

63.9%

Find the % of water in CaSO₃•2 H₂O

23.0%

21.1%

25.7%

30.9%

Find the % of water in MgSO₃• 6 H₂O

50.9%

48.2%

70.1%

23.5%

Which of the following is considered an empirical formula?

CH₃COOH

C₆H₁₂O₆

H₂O

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

SO2

SO3

SO4

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

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

Molecular Formula

Chemical Formula

Empirical Formula

Distance Formula

10.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.

What is the empirical formula of J?

C₄HNO₂

CH₂N₂O

C₂HNO₂

CHNO

11.

The empirical formula for a compound is CH₂ and its relative atomic mass (A_r) is 70. What is its molecular formula? Use the periodic table to help you.

CH₂

C₅H₁₀

C₇₀H₁₄₀

12.

What is the empirical formula of C₄H₆?

CH₃

C₂H₃

C₄H₆

13.

The empirical formula of C₂H₆O is

CHO

C₂H₆O

14.

What is the empirical formula of S₂O₈?

S₂O₈

SO₄

S₈O₂

15.

What is the empirical formula of P₃O₄?

P₃O₄

P₄O₃

16.

Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.

CrCl

CrCl₃

Cr₃Cl

Cr₂Cl₆

17.

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

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

18.

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

ionic formula

covalent formula

empirical formula

molecular formula

19.

What is the empirical formula for the following:

32.40% sodium, 22.5% sulfur; 45.1 % oxygen, 37.75% water?

Na₂SO₄H₆O₃

Na₂SO₄* 2H₂O

Na₂SO₄* 3H₂O

Na₂SO₄* (H₂O)

20.

Na₂CO₃ · 10H₂O is known as sodium sulfate ______

Hydroxide

Hydrate

Decahydrate

None of the above

21.

Name the following hydrate: NaCl * 5H₂O

sodium chloride

sodium monochloride pentahydrate

sodium chloride pentahydrate

pentahydrate

22.

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

MgCO₃ · 5H₂O

MgCO₃ · 4H₂O

MgCO₃ · 6H₂O

MgCO₃ · 1H₂O

23.

A compound is a hydrate when it...

is composed of only hydrogen and oxygen

is a state of water

traps water inside of the compound

repels water from the compound

24.

Name Cu₂CO₃

copper carbonate

copper (II) carbonate

copper (I) carbonate

copper carbon oxide

25.

If you had a 35.0 gram sample of the hydrate, what would the mass of just the water be?

35.0 g

10.1 g

24.9 g

28.8 g

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Mole Practice Quiz Part 2 (% comp. EFMF, hydrates)

Total questions: 25

Worksheet time: 2hrs 45mins

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