Molar Mass and Compound Composition

The video tutorial explains how to calculate the molar mass of barium carbonate (BaCO3). It begins by identifying the molar mass of barium from the periodic table, which is 137.33 grams per mole. Then, it adds the molar mass of carbon (12.01 grams per mole) and oxygen (16.00 grams per mole). Since there are three oxygen atoms, their total mass is calculated by multiplying 16.00 by 3. The final molar mass of barium carbonate is determined to be 197.34 grams per mole. The tutorial concludes with a summary of the calculation process.

What is the first step in finding the molar mass of a compound like barium carbonate?

• Divide the total mass by the number of elements.

• Add the atomic masses of all elements.

• Multiply the atomic masses by the number of atoms.

• Look up the atomic masses of the elements in the compound.

What is the molar mass of barium as found on the periodic table?

• 197.34 grams per mole

• 16.00 grams per mole

• 12.01 grams per mole

• 137.33 grams per mole

How many oxygen atoms are present in barium carbonate?

• Three

• Four

• Two

• One

What is the molar mass of carbon used in the calculation?

• 137.33 grams per mole

• 16.00 grams per mole

• 12.01 grams per mole

• 197.34 grams per mole

What is the final molar mass of barium carbonate (BaCO3)?

• 197.34 grams per mole

• 233.34 grams per mole

• 137.33 grams per mole

• 149.34 grams per mole