Percent Composition and Molar Mass of Ammonium Phosphate

The video tutorial explains how to calculate the percent composition by mass of each element in ammonium phosphate (NH4)3PO4. It begins with nitrogen, detailing the use of molar mass and the number of atoms to find its percent composition. The same method is applied to hydrogen and phosphorus, with specific calculations provided. Finally, the video covers the percent composition of oxygen, ensuring the total adds up to approximately 100%. The tutorial concludes with a brief summary and thanks from Dr. V.

What is the molar mass of nitrogen used in the calculation for ammonium phosphate?

• 18.02 grams per mole

• 16.00 grams per mole

• 14.01 grams per mole

• 12.01 grams per mole

How many nitrogen atoms are considered in the calculation for ammonium phosphate?

• 3

• 1

• 2

• 4

What is the percent composition by mass of nitrogen in ammonium phosphate?

• 20.00%

• 25.00%

• 30.00%

• 28.19%

How many hydrogen atoms are present in ammonium phosphate for the calculation?

• 14

• 12

• 10

• 8

What is the percent composition by mass of hydrogen in ammonium phosphate?

• 5.00%

• 8.13%

• 10.00%

• 12.00%

What is the percent composition by mass of phosphorus in ammonium phosphate?

• 15.00%

• 22.00%

• 18.00%

• 20.77%

How many oxygen atoms are considered in the calculation for ammonium phosphate?

• 3

• 2

• 4

• 5

What is the percent composition by mass of oxygen in ammonium phosphate?

• 40.00%

• 42.92%

• 45.00%

• 48.00%

What should the total percent composition by mass add up to approximately?

• 90%

• 100%

• 105%

• 95%

Who is the presenter of the video on percent composition by mass?

• Dr. A

• Dr. B

• Dr. C

• Dr. V