
Understanding Percent Composition by Mass
Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Practice Problem
•
Hard
Jennifer Brown
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary reason we cannot say water is ⅓ oxygen and ⅔ hydrogen by mass?
Because water is made of molecules.
Because water is a liquid.
Because water is a compound.
Because hydrogen and oxygen atoms have different atomic masses.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the percent composition by mass of an element in a compound?
Add the atomic masses of all elements and divide by the number of elements.
Divide the number of atoms by the total number of atoms.
Divide the mass of the element by the total molar mass and multiply by 100%.
Multiply the atomic number by the total mass.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition by mass of hydrogen in water?
11.19%
50%
88.81%
33.33%
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molecular formula of glucose?
C6H12O6
C12H22O11
C6H6
H2O
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many types of atoms are present in a glucose molecule?
Three
Four
Two
Five
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molar mass of glucose?
100 g/mol
180.156 g/mol
18.015 g/mol
342.3 g/mol
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you find the molar mass of a compound like glucose?
By adding the atomic numbers of all atoms.
By subtracting the mass of hydrogen from the total mass.
By dividing the total mass by the number of atoms.
By multiplying the number of atoms by their atomic masses and summing them up.
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