Molecular Weight and Composition Questions

The video tutorial explains how to calculate the molecular weight of sulfur trioxide (SO3). It begins by identifying the molecular weights of sulfur and oxygen from the periodic table. The tutorial then demonstrates how to multiply the weight of oxygen by three, as there are three oxygen atoms in SO3, and add it to the weight of sulfur. The final molecular weight of SO3 is calculated to be 80.07 grams per mole. The video concludes with a brief thank you from Dr. B.

What is the molecular weight of sulfur as found on the periodic table?

• 32.07 grams per mole

• 16.00 grams per mole

• 28.09 grams per mole

• 18.00 grams per mole

How many oxygen atoms are present in a molecule of SO3?

• 2

• 1

• 3

• 4

What is the molecular weight of a single oxygen atom?

• 14.01 grams per mole

• 12.01 grams per mole

• 18.00 grams per mole

• 16.00 grams per mole

What is the total molecular weight of SO3?

• 96.07 grams per mole

• 80.07 grams per mole

• 64.07 grams per mole

• 72.07 grams per mole

What is another term used for the molecular weight of a compound?

• Atomic mass

• Elemental mass

• Gram mass

• Molar mass