Question

The compound MgSO4 is called Epsom salts. How many grams will you need to prepare a bath containing 4.60 moles of Epsom salts?

Answer 1

Solution:

Number of moles of a substance in a sample is the mass in g divided by the molar mass, which gives the amount in moles

n = m/M

Molar mass of MgSO₄ 120.37 gram/mol

and than, calculate the mass of MgSO₄

m = n MgSO₄  × M MgSO₄ = 4.60 mol × 120.37 g/mol = 553.70 grams of MgSO₄

Answer: are needed to prepare 553.70 grams of MgSO₄.