Percent Composition and Molar Mass of C2H6

This video tutorial explains how to calculate the percent composition by mass of each element in ethane (C2H6). It begins with an introduction to the concept and the importance of finding the molar mass of the compound. The tutorial then provides a step-by-step guide to calculating the percent composition of carbon and hydrogen in C2H6, using their respective atomic masses and the molar mass of the compound. The video concludes with a summary of the calculations and a reminder that the percentages should add up to 100%.

What is the primary goal of the video tutorial?

• To find the percent composition by mass for each element in C2H6.

• To compare ethane with other hydrocarbons.

• To explain the structure of ethane.

• To discuss the uses of ethane in industry.

What is the molar mass of the compound C2H6?

• 28.05 grams per mole

• 30.08 grams per mole

• 32.10 grams per mole

• 34.12 grams per mole

How many carbon atoms are present in a molecule of C2H6?

• One

• Two

• Three

• Four

What is the percent composition by mass of carbon in C2H6?

• 79.85%

• 70.85%

• 85.85%

• 75.85%

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

• 1.03 grams per mole

• 1.02 grams per mole

• 1.01 grams per mole

• 1.00 grams per mole

How many hydrogen atoms are present in a molecule of C2H6?

• Five

• Four

• Six

• Seven

What is the percent composition by mass of hydrogen in C2H6?

• 21.15%

• 20.15%

• 19.15%

• 18.15%

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

• 90%

• 95%

• 100%

• 105%

Who is the presenter of the video?

• Dr. A

• Dr. B

• Dr. C

• Dr. D