Percentage Composition
Authored by Sonia Rodriguez
Science
10th - 12th Grade
NGSS covered
Used 39+ times
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent by mass of magnesium in MgO?
20%
40%
50%
60%
Tags
NGSS.HS-PS1-7
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Find the percent composition of Cu2S?
%Cu= 67.987 %S= 32.013
%Cu= 79.854 %S= 20.145
%Cu= 35.946 %S= 64.054
Tags
NGSS.HS-PS1-7
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many percent of chlorine is present in chloroform?
10.06%
0.84%
89.09%
99.99%
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is the percent composition of benzene, C6H6?
C = 50.%
H = 50.%
C = 85.7 %
H = 14.3%
C = 92.2%
H = 7.8%
C = 71.9%
H = 28.1%
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The mass % of aluminum in aluminum sulfate is:
35.94%
15.77%
45.70 %
21.93 %
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the general formula for the computation of percentage composition of the given element?
% mass of element = mass of element in the compound divided by mass of the compound times 100
% mass of element = mass of element in the compound divided by mass of the compound
% mass of element = mass of element in the compound divided by 100
% mass of element = mass of element in the compound
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Sodium chloride is a common salt and has vast variety of applications. The molecular formula of sodium chloride is NaCl. The molar mass of NaCl is MNaCl = 22.99 + 35.45 = 58.44 g mol−1. What percent constitute sodium(Na) in a sodium chloride ions?
39. 34%
49.35%
50%
63.15%
Tags
NGSS.MS-PS1-1
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