Question

A hydrate of magnesium sulfate has a mass of 13.52 g. The sample is heated until no water remains. The anhydrate has a mass of 6.60 g. Find the formula and name of the hydrate.

Answer 1

Answer:

molecular formula = MgSO4.7H2O

Name is Magnesium sulfate heptahydrate

Explanation:

A hydrate of magnesium sulfate has a mass of 13.52 g. This sample is heated until no water remains. The MgSO4 anhydrate has a mass of 6.60 g. Find the formula and name of the hydrate.

given

mass 1 = 13.52 g

mass 2 = 6.60 g

solution

MgSO4 × H2O

first we ge here mass of hydrate part that is here

mass of hydrate part = (13.52 g - 6.60 g)

mass of hydrate part = 6.92 g

and

now we get here percentage of hydrate that is

percentage of hydrate = (6.92 / 13.52) x 100

percentage of hydrate = 51.18 %

so molar mass will be

molar mass of hydrate MgSO4 = 120.366 g/mol = 49.82 %

and for 100% = 241.6 g

so

mass of H2O = 121.23 g

and

moles of H2O = 7

so we can say that molecular formula will be MgSO4.7H2O

and name is Magnesium sulfate heptahydrate