Relative Formula Mass and Moles

This video tutorial from Free Science Lessons explains how to calculate the number of moles of a compound, focusing on higher-tier material. It covers the concept of relative formula mass and provides step-by-step examples using compounds like calcium carbonate, magnesium chloride, lithium sulfate, and burum hydroxide. The video concludes with a mention of additional resources available in a workbook.

What is the equation used to calculate the number of moles of an element?

• Mass in grams multiplied by relative atomic mass

• Mass in grams divided by relative atomic mass

• Mass in grams plus relative atomic mass

• Relative atomic mass divided by mass in grams

What is the symbol for relative formula mass?

• F

• A

• M

• R

How do you calculate the relative formula mass of a compound?

• Divide the atomic masses of all atoms in the compound

• Subtract the atomic masses of all atoms in the compound

• Multiply the atomic masses of all atoms in the compound

• Add the atomic masses of all atoms in the compound

What is the relative formula mass of calcium carbonate?

• 100

• 44

• 56

• 88

How many moles are in 300 grams of calcium carbonate?

• 1 mole

• 2 moles

• 3 moles

• 4 moles

What is the relative formula mass of magnesium chloride?

• 95

• 85

• 110

• 120

How many moles are in 380 grams of magnesium chloride?

• 3 moles

• 4 moles

• 5 moles

• 2 moles

What is the relative formula mass of lithium sulfate?

• 110

• 100

• 90

• 120

How many moles are in 990 grams of lithium sulfate?

• 11 moles

• 10 moles

• 9 moles

• 8 moles

How many moles are in 64.5 grams of barium hydroxide?

• 2.5 moles

• 2 moles

• 1.5 moles

• 1 mole