Free Printable Grams Moles Grams Grams Test

Worksheets

Grams Moles Grams Grams Test

Total questions: 20

Worksheet time: 35mins

Name

Class

Date

How many molecules are in 2.5 mol of NaCl?

1.50 x10²⁴molecules

1.50 molecules

4.15 molecules

1.51 x10²⁴molecules

How many moles are in 19.82 g Mg?

1.23 mol Mg

481.70 mol Mg

1.00 mol Mg

0.82 mol Mg

How many moles are in 3.01 x 10²² atoms of magnesium?

0.05 moles

1.81 x 10⁴⁶ moles

5.00 x 10²¹ moles

5.00 moles

How many grams are in 1.2 x 10²⁴ atoms of C?

29.34 grams

23.94 grams

6.02 grams

1.21 grams

What is the percent composition by mass of sulfur (S) in the compound MgSO₄?

20.22%

19.85%

26.64%

28.64%

Calculate the number of atoms in 0.0340 g Zn.

5.200 x 10^-4 atoms Zn

3.130 x 10²³ atoms Zn

3.130 x 10²⁰ atoms Zn

1 atom Zn

Determine the mass of 4.20 moles of C₆H₁₂

354 g

84 g

337 g

421 g

What is the molar mass of PbSO₄

303.3 g/mol

294.7g/mol

163.8g/mol

372g/mol

How many grams are in 1.2 moles of Neon?

0.05 grams

16.6 grams

21.2 grams

24 grams

10.

What is the percent composition of Nitrogen in NO₂? (rounded)

30%

40%

50%

60%

11.

Which of the following is NOT needed to calculate percent composition?

Mass of specific element

Molar Mass

Avogadro's Number

Division

12.

How many moles are there in 58 g of MgF₂?

62.3

3613.4

.931

1.07

13.

How many moles are there in 8.1 x 10²⁴ molecules of NH₃?

1.346

13.46

134.6

0.1346

14.

What are the units in molar mass?

grams

moles

moles/gram

grams/mole

15.

(0902) Which compound has the smallest molar mass?

CO₂

H₂O

H₂O₂

16.

(0901) Avogadro’s number is:

6.02 x 10²²

6.02 x 10²³

3.01 x 10²³

17.

(0903) How many moles are in 16.94 g of water? (hint: do you know the formula for water?)

16.94 moles

0.9403 mole

305.2 moles

1.063 moles

18.

Which expression below show the correct method of determining the percent composition of Sodium in Na₂CO₃?

%Na = (22.99g/106g) x 100

%Na = (22.99g/106) / 100

%Na = (45.98g/106g) x 100

%Na = (106/45.98g) x 100

19.

Find the percent composition of hydrogen in (NH₄)₂S.

11.8%

41.1%

47.1%

20.

Which has more molecules?

1 mole CO₂

1 mole of N₂O₄

1 mole of H₂O

They are all the same

100 %

Grams Moles Grams Grams Test

Total questions: 20

Worksheet time: 35mins

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