Percent Composition

Quiz
•
Science
•
10th Grade
•
Hard
Standards-aligned
Lisa Thompson
FREE Resource
16 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
NaPO2
Na2PO3
Na3PO4
NaPO4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the percent composition of Cu2S (molar mass 159.16 g/mol)?
%Cu= 67.987 %S= 32.013
%Cu= 79.854 %S= 20.145
%Cu= 35.946 %S= 64.054
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the percent composition of CaCl2?
Ca: 36.11%; Cl: 63.88%
Ca: 53.12%; Cl: 100%
Ca: 36.11%; Cl: 83.56%
Ca: 46.11%; Cl: 63.88%
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent by mass of magnesium in MgO?
20%
40%
50%
60%
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
20%
27%
46%
53%
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent by mass of Cu in CuBr2?
50%
71.6%
28.4%
44.3%
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent by mass of chlorine in NaCl?
39%
61%
35%
65%
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