1. 51.8 g of magnesium sulfate heptahydrate is heated in an oven until all the water...

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Question

Answer 1

Answer #1

molar mass of MgSO4.7H2O = 246.5 g/mol
number of mol of MgSO4.7H2O = (mass of MgSO4.7H2O)(molar mass of MgSO4.7H2O)
= 51.8/246.5
= 0.210 mol

1 mol of MgSO4.7H2O give 1 mol of MgSO4
0.210 mol of MgSO4.7H2O give 0.210 mol of MgSO4
so,
number of mol of MgSO4 = 0.210 mol

molar mass of MgSO4 = 120.4 g/mol
mass of MgSO4 = (number of mol of MgSO4)*(molar mass of MgSO4)
= 0.210*120.4
= 25.2 g/mol

Answer: 25.2 g

I am allowed to do only one question at a time

Answer 2

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