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Mole and Empirical Molecular Formulas

Authored by Charles Martinez

Chemistry

9th Grade

NGSS covered

Mole and Empirical Molecular Formulas
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22 questions

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1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

C2H3O2
CH2O
C2H4O2
C3H8O3

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

 NaPO2
Na2PO3
Na3PO4
NaPO4

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

C3H8
CH4
C2H2
C4H10

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

20%

27%

46%

53%

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

Cu3O8
CuO4
Cu2O
Cu4O10

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 120?

CH2O

C2H4O2

C4H8O4

C6H12O6

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following represents an empirical formula?

H2O2
HC2O4
H2O6
H12O48

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