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Chemistry

Total questions: 25

Worksheet time: 3585secs

Name

Class

Date

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

What is the percent by mass of sodium in NaCl?

39%

61%

35%

65%

What is the molar mass of CO₂?

12 g/mol

16 g/mol

32 g/mol

44 g/mol

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

27.48% Mg

43.11% Mg

16.00% Mg

12.63% Mg

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)

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

Mg₄N₃

MgN₂

Mg₃N₂

MgN

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

Mg₄N₃

MgN₂

Mg₃N₂

MgN

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃ and C₂H₆O₂

CH₄ and C₂H₆

10.

A 5.00 g sample of a compound consisting of calcium and chlorine contains 1.82 g of calcium and 3.23 g of chlorine. What is the empirical formula

CaCl₂

Ca₂Cl₂

Ca₂Cl₄

Ca₄Cl₂

11.

What is the empirical formula for C₃H₈

C₃H₈

C₆H₁₆

CH_2.7

12.

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

Mg₄N₃

MgN₂

Mg₃N₂

MgN

13.

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

20%

27%

46%

53%

14.

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

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

15.

What is the molecular formula for a compound with the empirical formula K₂SO₄ and a molecular mass of 696G?

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

16.

EF = CF₂

_{Molecular formula mass = 192}

MF = ?

C₄F₈

C₄F

CF₈

C₂F₄

17.

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

18.

The name of P₄S₁₀ is

phosphorous sulfide

phosphorus sulfide

tetraphosphorus decasulfide

phosphorus (X) sulfide

19.

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

20.

Concentration is

the amount of solute in the solvent

the amount of solvent in the solute

density

particle size

21.

How many moles of HCl (molar mass = 36.46g/mol) are present in .70L of a .33M HCl solution. $\ Molarity=\ \frac{moles\ ofsolute}{L\ of\ solution}$

.23 mol

.28 mol

.38 mol

.47 mol

22.

What is the molarity of 4 grams of sodium chloride (NaCl) in 3,800 mL of solution?

0.018 M

0.018 m

1.052 M

1.052 m

23.

How many moles of NaCl are present in a solution with a molarity of 8.59M and 125 mL of solution?

1.074 mol

62.7 mol

1.07 mol

62.7 grams

24.

Which of the following does not explain 2 mol/dm³ copper(II) sulfate?

100 cm³ consists of 2 mol of copper(II) sulfate.

1000 cm³ consists of 2x6.02x10²³ copper(II) sulfate.

1 dm³ consists of 2x6.02x10²³ copper(II) sulfate.

1 dm³ consists of 2 mol of copper(II) sulfate.

25.

You need to make 200 mL of a 0.20 M aqueous solution of sodium chloride. The only available solution is 1.0 M. Determine how to make the needed dilution.

Add 160 mL to the initial volume

Add 160 grams to the initial volume

Evaporate 160 mL from the initial volume

the experiment cannot be conducted with the materials provided

Reset

Chemistry

Total questions: 25

Worksheet time: 3585secs

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