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.

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

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

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