Question

Calculate the number of moles of the following: (a) 8 pg of sulphur dioxide molecules (SO2) (b) 33.8 ng of hydrated copper sulphate (CuSO4.5H2O)"

Answer 1

For 8 pg of sulphur dioxide molecules (SO2), the number of moles is 0.2497 mol. For 33.8 ng of hydrated copper sulphate (CuSO4.5H2O), the number of moles is 1.355 x 10^-4 mol.

Step-by-step explanation:

(a) 8 pg of sulphur dioxide molecules (SO2):

To calculate the number of moles, we need to use the formula:

Number of moles = mass / molar mass

Molar mass of SO2 = 32.07 g/mol

Number of moles of SO2 = 8 pg / 32.07 g/mol = 0.2497 mol

(b) 33.8 ng of hydrated copper sulphate (CuSO4.5H2O):

To calculate the number of moles, we need to use the formula:

Number of moles = mass / molar mass

Molar mass of CuSO4.5H2O = 249.68 g/mol

Number of moles of CuSO4.5H2O = 33.8 ng / 249.68 g/mol = 1.355 x 10^-4 mol