Molar Mass and Compound Composition

This video tutorial explains how to calculate the molar mass of potassium chromate (K2CrO4). It begins by identifying the molar masses of individual elements: potassium, chromium, and oxygen, using the periodic table. The video then demonstrates how to multiply these values by the number of atoms present in the compound and sum them to find the total molar mass of K2CrO4, which is 194.19 grams per mole. The tutorial concludes with a brief explanation of the significance of molar mass in terms of moles and grams.

What is the first step in determining the molar mass of a compound?

• Identify the elements in the compound

• Calculate the volume of the compound

• Find the density of the compound

• Determine the temperature of the compound

How many potassium atoms are present in K2CrO4?

• Three

• Two

• Four

• One

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

• 12.01 grams per mole

• 16.00 grams per mole

• 51.99 grams per mole

• 39.10 grams per mole

How many oxygen atoms are present in potassium chromate?

• Two

• Four

• Three

• Five

What is the total molar mass of potassium chromate (K2CrO4)?

• 150.20 grams per mole

• 194.19 grams per mole

• 200.00 grams per mole

• 180.15 grams per mole

What does the molar mass of a compound represent?

• The density of one mole of the compound

• The mass of one mole of the compound

• The number of atoms in one mole of the compound

• The volume of one mole of the compound