Calculating Relative Formula Masses (CFU)

Calculating Relative Formula Masses (CFU)

11th Grade

15 Qs

quiz-placeholder

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Calculating Relative Formula Masses (CFU)

Calculating Relative Formula Masses (CFU)

Assessment

Quiz

Chemistry

11th Grade

Practice Problem

Medium

Created by

Wiser Wise

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15 questions

Show all answers

1.

MATCH QUESTION

5 mins • 10 pts

Match the following compounds with their relative formula masses (Mr).

O2

18

Ne

32

H2O

44

CO2

20

2.

MULTIPLE CHOICE QUESTION

5 mins • 6 pts

58.5

60

55.5

57

Answer explanation

To find the relative formula mass of sodium chloride (NaCl), add the atomic masses of sodium (Na, 23) and chlorine (Cl, 35.5). Thus, 23 + 35.5 = 58.5, making the correct answer 58.5.

3.

DROPDOWN QUESTION

5 mins • 8 pts

44

46

42

48

Answer explanation

The relative formula mass of carbon dioxide (CO₂) is calculated by adding the atomic masses of its components: carbon (12) and two oxygens (16 each). Thus, Mr = 12 + (2 × 16) = 44. Therefore, the correct answer is 44.

4.

MULTIPLE CHOICE QUESTION

5 mins • 6 pts

100

98

102

104

Answer explanation

To calculate the relative formula mass of calcium carbonate (CaCO₃), add the atomic masses: Ca (40) + C (12) + 3×O (16) = 40 + 12 + 48 = 100. Thus, the correct answer is 100.

5.

MULTIPLE CHOICE QUESTION

5 mins • 6 pts

160

150

170

180

Answer explanation

To find the relative formula mass of Fe2O3, calculate: (2 x 55.85 for Fe) + (3 x 16.00 for O) = 111.70 + 48.00 = 159.70, rounded to 160. Thus, the correct answer is 160.

6.

MULTIPLE CHOICE QUESTION

5 mins • 6 pts

98

96

100

102

Answer explanation

To find the relative formula mass of sulfuric acid (H₂SO₄), add the atomic masses: H (1) x 2 + S (32) + O (16) x 4 = 2 + 32 + 64 = 98. Thus, the correct answer is 98.

7.

MULTIPLE CHOICE QUESTION

5 mins • 6 pts

17

18

16

19

Answer explanation

To calculate the relative formula mass of ammonia (NH₃), add the atomic masses: Nitrogen (N) = 14 and Hydrogen (H) = 1 (3 H atoms). So, 14 + (3 x 1) = 17. Therefore, the correct answer is 17.

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