Question

What is the percent by mass of water in Na2SOa 10H20?total mass of element in compoundUse%Elementx 100molar mass of compoundO 5.59%O 11.26%44.08%O 55.92%

Answer 1

Molar mass Na₂SO₄. 10H₂O = 322.19 g/mol

Molar mass  H₂O = 18.0

% Element =  molar mass / total mass x 100

% Element = 18 / 322,19 x 100 

% Element =  5.59 %

Answer A

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