Number of moles = weight / molecular weight

weight in gram, molecular weight in gram per mole.

Using the online calculator you can verify your answer.

Number of Moles Calculator

Number of Moles:

Worksheet

Calculate the number of moles based on the given weight and molecular weight of some simple inorganic salts:

1. Calculate the number of moles in 58.44 grams of NaCl. (Molecular weight = 58.44 g/mol)
2. Calculate the number of moles in 117 grams of MgCl2. (Molecular weight = 95.21 g/mol)
3. Calculate the number of moles in 40 grams of CaCO3. (Molecular weight = 100.09 g/mol)
4. Calculate the number of moles in 98 grams of H2SO4. (Molecular weight = 98.09 g/mol)
5. Calculate the number of moles in 150 grams of KNO3. (Molecular weight = 101.1 g/mol)
6. Calculate the number of moles in 80 grams of Na2SO4. (Molecular weight = 142.04 g/mol)
7. Calculate the number of moles in 75 grams of BaCl2. (Molecular weight = 137.33 g/mol)
8. Calculate the number of moles in 180 grams of Na3PO4. (Molecular weight = 163.94 g/mol)
9. Calculate the number of moles in 50 grams of (NH4)2SO4. (Molecular weight = 132.14 g/mol)
10. Calculate the number of moles in 162 grams of Al2(SO4)3. (Molecular weight = 342.15 g/mol)
11. Calculate the number of moles in 100 grams of Na2CO3. (Molecular weight = 105.99 g/mol)
12. Calculate the number of moles in 78 grams of K2SO4. (Molecular weight = 174.26 g/mol)
13. Calculate the number of moles in 70 grams of Ca(NO3)2. (Molecular weight = 164.1 g/mol)
14. Calculate the number of moles in 133 grams of Na2SO3. (Molecular weight = 126.04 g/mol)
15. Calculate the number of moles in 95 grams of FeCl3. (Molecular weight = 162.2 g/mol)
16. Calculate the number of moles in 35 grams of AgNO3. (Molecular weight = 169.87 g/mol)
17. Calculate the number of moles in 120 grams of NaHCO3. (Molecular weight = 84.01 g/mol)
18. Calculate the number of moles in 92 grams of MgSO4. (Molecular weight = 120.37 g/mol)
19. Calculate the number of moles in 111 grams of Ba(NO3)2. (Molecular weight = 261.34 g/mol)
20. Calculate the number of moles in 90 grams of CuSO4. (Molecular weight = 159.61 g/mol)

Note: Molecular weight is given in g/mol for each compound. For the calculations, the formula to use is:

Number of moles = given weight (grams) / molecular weight (g/mol)