You are given
the hydrate Na2SO4.10H2O. You are required to get the percentage of water in
this chemical substance. The first thing to do is to get the molar mass of Na2SO4.10H2O
and Na2SO4. The molar masses are 322.24 grams per mole and 142.04 grams per
mole respectively. The formula in getting the percentage of water is
%=[1-(grams
of Na2SO4/grams of Na2SO4.10H2O)]*100.
Substitute
the molar masses of Na2SO4.10H2O and Na2SO4.
%=[1-(142.04 grams
of Na2SO4/322.24 grams of Na2SO4.10H2O)]*100.
% of water
= 55.92%
