Convert Sample Mass into Moles - Practice 1

5 questions0m 0s

Learn the skill

Amount in moles equals sample mass divided by molar mass. Molar mass is mass per mole, not the count of molecules in the sample. Use the supplied rounded value rather than silently switching precision.

Worked example

A 90 g sample with molar mass 30 g/mol contains 90/30 = 3 mol.

Question 1 Paper sample 1 has mass 40 g and supplied molar mass 20 g/mol. What amount is present in mol? Answer

Question 2 Paper sample 2 has mass 75 g and supplied molar mass 25 g/mol. What amount is present in mol? Answer

Question 3 Paper sample 3 has mass 120 g and supplied molar mass 30 g/mol. What amount is present in mol? Answer

Question 4 Paper sample 4 has mass 100 g and supplied molar mass 20 g/mol. What amount is present in mol? Answer

Question 5 Paper sample 5 has mass 150 g and supplied molar mass 25 g/mol. What amount is present in mol? Answer