Moles Worksheet
Moles Worksheet
1) Define “mole”.
2) How many moles are present in 34 grams of Cu(OH)2?
3) How many moles are present in 2.45 x 1023 molecules of CH4?
4) How many grams are there in 3.4 x 1024 molecules of NH3?
5) How much does 4.2 moles of Ca(NO3)2 weigh?
6) What is the molar mass of MgO?
7) How are the terms “molar mass” and “atomic mass” different from one another?
8) Which is a better unit for expressing molar mass, “amu” or “grams/mole”?
Moles Worksheet (Solutions)
1) Define “mole”.
6.02 x 1023 of anything, usually atoms or molecules.
2) How many moles are present in 34 grams of Cu(OH)2?
0.35 moles
3) How many moles are present in 2.45 x 1023 molecules of CH4?
0.41 moles
4) How many grams are there in 3.4 x 1024 molecules of NH3?
96 grams
5) How much does 4.2 moles of Ca(NO3)2 weigh?
689 grams
6) What is the molar mass of MgO?
40.3 grams/mole
7) How are the terms “molar mass” and “atomic mass” different from one another?
“Molar mass” is used to describe the mass of one mole of a chemical compound, while “atomic mass” is used to describe the mass of one mole of an element or the mass of one atom of an element.
8) Which is a better unit for expressing molar mass, “amu” or “grams/mole”?
“Grams/mole” is better, because any macroscopic amount of a substance is better expressed in grams than amu.
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