Moles and Molar Mass Concepts

This video tutorial explains how to use molar mass as a conversion factor in chemistry. It covers converting grams to moles, moles to atoms, and specific examples involving oxygen, sodium oxide, and calcium phosphate. The video demonstrates the use of Avogadro's number and stoichiometry to perform these conversions, emphasizing the importance of molar mass in chemical calculations.

What is the molar mass of one mole of oxygen atoms?

• 16.00 g

• 32.00 g

• 8.00 g

• 12.00 g

Which number is used to convert moles to atoms?

• Avogadro's number

• Euler's number

• Planck's constant

• Boltzmann's constant

How many grams does one mole of O2 weigh?

• 16 g

• 32 g

• 64 g

• 8 g

If you have 5 grams of O2, how many moles of O2 do you have?

• 0.156 moles

• 1.25 moles

• 0.312 moles

• 0.625 moles

What is the molar mass of sodium oxide?

• 100.00 g/mol

• 44.01 g/mol

• 58.44 g/mol

• 77.98 g/mol

How many moles of sodium are in one mole of sodium oxide?

• 1 mole

• 2 moles

• 3 moles

• 4 moles

What is the first step in converting grams of calcium phosphate to atoms of oxygen?

• Convert to atoms of calcium

• Convert to grams of oxygen

• Convert to moles of oxygen

• Convert to moles of calcium phosphate

How many oxygen atoms are in one mole of calcium phosphate?

• 10 atoms

• 8 atoms

• 6 atoms

• 4 atoms

What is the molar mass of calcium phosphate used in the conversion?

• 400.18 g/mol

• 150.18 g/mol

• 200.18 g/mol

• 310.18 g/mol

How many atoms of oxygen are in 157 grams of calcium phosphate?

• 3.66 * 10^24 atoms

• 2.44 * 10^24 atoms

• 1.22 * 10^24 atoms

• 4.88 * 10^24 atoms