Atomic Mass and Molar Calculations

The video tutorial explains how to calculate the molar mass of dinitrogen pentoxide (N2O5). It begins by identifying the molar masses of nitrogen and oxygen from the periodic table, then multiplies these by the number of atoms in N2O5. The final molar mass is calculated to be 108.02 grams per mole. The video concludes by noting that different periodic tables may yield slightly different results due to varying decimal places.

What is the atomic mass of nitrogen as found on the periodic table?

• 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 present in N2O5?

• Five

• Three

• Two

• One

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

• 16.00 grams per mole

• 18.02 grams per mole

• 14.01 grams per mole

• 12.01 grams per mole

What is the calculated molar mass of N2O5?

• 118.02 grams per mole

• 108.02 grams per mole

• 128.02 grams per mole

• 98.02 grams per mole

Why might the calculated molar mass of N2O5 differ slightly?

• Due to rounding errors in calculations

• Because of different periodic table versions

• Incorrect counting of atoms

• Using the wrong chemical formula