Molar Mass and Composition of Sucrose

The video tutorial explains how to calculate the percent composition by mass for each element in the compound sucrose (C12H22O11). It begins with finding the molar mass of sucrose, followed by calculating the percent composition of carbon, hydrogen, and oxygen. The tutorial provides step-by-step instructions, including using atomic masses from the periodic table and performing calculations to determine the percentage of each element in the compound. The video concludes with a summary of the results and emphasizes the importance of rounding and accuracy in calculations.

What is the chemical formula of sucrose?

• C6H12O6

• C12H22O11

• C2H5OH

• CH4

Why is it important to calculate the molar mass of sucrose?

• To calculate the density

• To find the percent composition by mass

• To determine the number of molecules

• To measure the volume

What is the molar mass of sucrose?

• 180.18 g/mol

• 342.34 g/mol

• 98.08 g/mol

• 58.44 g/mol

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

• 12

• 11

• 6

• 22

What is the percent composition of carbon in sucrose?

• 6.49%

• 51.41%

• 12.01%

• 42.10%

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

• 22

• 12

• 11

• 6

What is the percent composition of hydrogen in sucrose?

• 51.41%

• 6.49%

• 42.10%

• 1.01%

How many oxygen atoms are present in a molecule of sucrose?

• 11

• 6

• 12

• 22

What is the percent composition of oxygen in sucrose?

• 42.10%

• 6.49%

• 51.41%

• 16.00%

What should the sum of the percent compositions of all elements in sucrose be approximately?

• 50%

• 75%

• 100%

• 150%