
% Composition and Empirical-Molecular Formula
Authored by Alison Kelley
Chemistry
11th Grade
NGSS covered
Used 29+ times

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18 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?
29%
43%
57%
73%
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Magnesium bromide (one magnesium atom with two bromine atoms) has a chemical formula of MgBr2. If you look at the total atomic mass of MgBr2, does magnesium or bromine make up more of the mass?
bromine
magnesium
they are exactly the same
it is impossible to tell
Tags
NGSS.MS-PS1-1
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Lithium phosphide (three lithium atoms with one phosphorus atom) has a chemical formula of Li3P. If you look at the total atomic mass of Li3P, does lithium or phosphorus make up more of the mass?
lithium
phosphorus
they are exactly the same
it is impossible to tell
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition of Benzene, C6H6?
H = 50%
H = 14.3%
H = 7.8%
H = 28.1%
Tags
NGSS.HS-PS1-1
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Find the percent composition of Cu2S?
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
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