Percent Composition and Molar Mass

Percent Composition and Molar Mass

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Aiden Montgomery

FREE Resource

The video tutorial explains how to calculate the percent composition by mass for each element in benzene (C6H6). It begins with an introduction to the concept and the importance of finding the molar mass of the compound. The tutorial then details the calculation process for carbon and hydrogen, providing the percent composition for each element. The video concludes with a summary of the steps involved in determining the percent composition by mass.

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9 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the chemical formula for benzene?

C8H8

C7H7

C6H6

C5H5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is it important to calculate the molar mass of a compound?

To measure the temperature of the compound

To identify the color of the compound

To find the percent composition by mass

To determine the number of atoms in a molecule

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the molar mass of benzene (C6H6)?

78.12 g/mol

90.18 g/mol

72.15 g/mol

84.16 g/mol

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many carbon atoms are present in benzene?

4

5

6

7

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent composition of carbon in benzene?

92.24%

90.24%

85.24%

88.24%

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the atomic mass of hydrogen used in the calculation?

1.03 g/mol

1.04 g/mol

1.02 g/mol

1.01 g/mol

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent composition of hydrogen in benzene?

8.76%

6.76%

5.76%

7.76%

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What should the sum of the percent compositions of all elements in a compound be?

100%

110%

95%

90%

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the significance of finding the percent composition by mass?

To determine the physical state of the compound

To find the color of the compound

To understand the contribution of each element to the compound's mass

To calculate the boiling point of the compound