% Composition of compound
Authored by Flora Valdez
Chemistry
Professional Development
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the general formula for the computation of percentage composition of the given element?
a. % mass of element = mass of element in the compound divided by mass of the compound times 100
b. % mass of element = mass of element in the compound divided by mass of the compound
c. % mass of element = mass of element in the compound divided by 100
d. % mass of element = mass of element in the compound
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent by mass of magnesium in MgO?
a. 20%
b. 40%
c. 50%
d. 60%
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent by mass of chlorine in NaCl?
a. 39%
b. 61%
c. 35%
d. 36%
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a. 24%
b. 48%
c. 49%
d. 65%
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a. 24%
b. 49%
c. 51%
d. 65%
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition of Benzene, C6H6?
a. C = 50%
H = 50%
b. C = 85.7 %
H = 14.3%
c. C = 92.2%
H = 7.8%
d. C = 71.9%
H = 28.1%
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?
a. K
b. C
c. N
d. None
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