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Percent Composition

Chemistry

9th - 12th Grade

NGSS covered

Used 1K+ times

Percent Composition
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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the percent by mass of oxygen in MgO?

20%
40%
50%
60%

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of magnesium in MgO?

20%
40%
50%
60%

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of sodium in NaCl?

39%
61%
35%
65%

Tags

NGSS.HS-PS1-7

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the percent by mass of chlorine in NaCl?

39%
61%
35%
65%

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?

24%
49%
51%
65%

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?

24%
49%
51%
65%

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

20%
27%
46%
53%

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