
Molecular Formulas
Authored by Lisa Thompson
Science
11th Grade
NGSS covered

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which pair has the same empirical formula?
NaCrO4 and Na2Cr2O7
C2H4O2 and C6H12O6
C3H6O3 and C2H6O2
CH4 and C2H6
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent by mass of oxygen in MgO?
20%
40%
50%
60%
Tags
NGSS.HS-PS1-7
3.
MULTIPLE CHOICE QUESTION
1 min • 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
Tags
NGSS.HS-PS1-1
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?
CO2Li3
Li2CO3
Li3CO2
LiCO5
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What's the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?
CO2Li3
Li2CO3
Li3CO2
LiCO5
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
C2H6O What is the empirical formula?
CHO
C2H6O
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the molecular formula of a compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole?
C2O4H8
C8O2H4
C4O2H8
C4O8H2
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