Molar Mass and Chemical Formulas

This video tutorial explains how to calculate the molar mass of lithium nitrate (LiNO3). It begins by identifying the molar masses of lithium, nitrogen, and oxygen from the periodic table. The tutorial then demonstrates how to calculate the total molar mass of LiNO3 by adding the individual molar masses, considering the three oxygen atoms. The final molar mass is determined to be 68.95 grams per mole. The video concludes with a note on the precision of periodic table values, which may vary slightly depending on the source.

What is the chemical formula for lithium nitrate?

• LiNO3

• LiN3O

• LiO3N

• Li3NO

How many oxygen atoms are present in lithium nitrate?

• Two

• Three

• Four

• One

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

• 14.01

• 12.01

• 16.00

• 6.94

What is the calculated molar mass of lithium nitrate?

• 70.00 grams per mole

• 68.95 grams per mole

• 60.00 grams per mole

• 65.00 grams per mole

Why might there be slight variations in the calculated molar mass?

• The chemical formula might be incorrect.

• The number of atoms in the compound might change.

• Different periodic tables may round atomic masses differently.

• The units used might be different.