Understanding Urea: Molar Mass and Composition

This video tutorial explains how to calculate the molar mass of urea (CH4N2O). It begins with an introduction to the concept of molar mass and then provides a detailed step-by-step calculation using the atomic masses of carbon, hydrogen, nitrogen, and oxygen. The final molar mass is determined to be 60.07 grams per mole. The video concludes with a note on how different periodic tables might yield slightly different results due to rounding differences.

What is the chemical formula for urea?

• NH3

• CH4N2O

• C2H4O2

• H2O

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

• 2

• 1

• 4

• 3

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

• 12.01 grams per mole

• 1.01 grams per mole

• 16.00 grams per mole

• 14.01 grams per mole

Which element in urea has an atomic mass of 16.00 grams per mole?

• Carbon

• Hydrogen

• Nitrogen

• Oxygen

What is the total molar mass of urea as calculated in the video?

• 64.02 grams per mole

• 62.00 grams per mole

• 60.07 grams per mole

• 58.05 grams per mole

Why might the calculated molar mass differ slightly when using different periodic tables?

• Due to rounding differences in atomic masses

• Because of different chemical formulas

• Variations in molecular structure

• Changes in temperature