Free Printable Unit 6 Revew

Worksheets

Unit 6 Revew

Total questions: 25

Worksheet time: 4hrs 10mins

Name

Class

Date

How many molecules are in 2.50 mol of NaCl?

1.51x10²³

146

4.15

1.51x10²⁴

How many atoms of carbon are in 6.00 g of carbon?

1.20x10²⁴atoms C

6.02x10²³atoms C

3.01x10²³atoms C

1.50x10²³atoms C

What is the mass of one mole of silver?

32.06 g

107.87 g

14.01 g

22.99 g

What is the molar mass of PbSO₄?

303.27 g/mol

255.27 g/mol

163.87 g/mol

372.27 g/mol

How many molecules are there in 31.8 moles of water?

5.28 x 10^-23

1.91 x 10²⁵

5.28x 10^-25

1.91 x 10²²

How many moles are in 16.94 g of water?

16.94 mol H₂O

0.9401 mol H₂O

305.3 mol H₂O

1.063 mol H₂O

What is the mass in grams of 5.90 mol C₈H_18?

0.0512 g

19.4 g

673 g

389 g

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃?

1.26 moles

0.800 moles

7670 moles

1.63 x 10^-22 moles

Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C₆H₁₂O₆?

1 mole = 78.12 g

1 mole = 22.4 L

1 mol = 6.02x 10²³ particles

more than one

10.

What does Avogadro's number represent?

the molar mass in 1 mole of an element

the amount of matter needed to reach 1 gram

the number of particles in 1 mole of a substance

the number of days left to the end of the school year

11.

How many molecules of water are in a 821.3 g sample?

45.58 molecules

8.232 x 10²⁵ molecules

8.909 x 10²⁷ molecules

2.744 x 10²⁵ molecules

12.

What is the mass of 4.98 x 10²⁴atoms of Zn?

541 g

8.27 g

0.122 g

4.59 x 10⁴⁶ g

13.

How many formula units of calcium chloride are in a 25.69 g sample?

1.394 x 10²³ F.U.'s

2851 F.U.'s

0.2315 F.U.'s

3.845 x 10²⁵ F.U.'s

14.

What would be the mass of 9.76 x 10²² formula units of SrCl₂?

0.1622 g

25.7 g

20.0 g

0.3589 g

15.

How many atoms of carbon are in 6.00 grams of carbon?

1.20x10²⁴atoms C

6.02x10²³atoms C

3.01x10²³atoms C

1.50x10²³atoms C

16.

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

17.

What is the percent composition by mass of oxygen in the compound MgSO₄?

20%

27%

46%

53%

18.

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

SO2

SO3

SO4

19.

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

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

20.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

NaPO₂

Na₂PO₃

Na₃PO₄

NaPO₄

21.

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

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

22.

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

23.

An empirical formula:

is a formula that calculates the coefficients of a compound in a balanced equation.

is the simplest whole-number ratio of moles of elements in the compound.

24.

Find the percent composition of each element in Cu₂S.

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

25.

Which of the following is considered an empirical formula?

CH₃COOH

C₆H₁₂O₆

H₂O

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Unit 6 Revew

Total questions: 25

Worksheet time: 4hrs 10mins

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