
Percent Composition and Molar Mass

Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Hard

Emma Peterson
FREE Resource
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9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary goal when determining the percent composition by mass of elements in a compound?
To identify the color of the compound
To determine the volume of the compound
To calculate the mass of each element in the compound
To find the number of atoms in the compound
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molar mass of carbon used in the calculation for CH4?
1.01 grams per mole
12.01 grams per mole
16.05 grams per mole
14.01 grams per mole
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many hydrogen atoms are present in a methane (CH4) molecule?
Four
Three
Two
One
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition of carbon in CH4?
100.00%
25.17%
74.83%
50.00%
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molar mass of hydrogen used in the calculation for CH4?
1.01 grams per mole
14.01 grams per mole
16.05 grams per mole
12.01 grams per mole
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition of hydrogen in CH4?
25.17%
74.83%
100.00%
50.00%
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might your calculated percent composition differ slightly from the example given?
Because of a different compound
Due to a different number of atoms
Because of incorrect molar mass values
Due to different rounding conventions
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What should the sum of the percent compositions of all elements in a compound be?
25%
75%
100%
50%
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Who is the presenter of the video tutorial?
Dr. D
Dr. C
Dr. B
Dr. A
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