The mass percentage of water in magnesium sulfateheptahydrate, MgSO4 * 7H2O is..

Question

The mass percentage of water in magnesium sulfateheptahydrate, MgSO4 * 7H2O is... Ok my professor gives the answer: 51.2% ---- How is thispossible I keep getting something different... i keep getting 60%-ish Please help me answer this question...... thank you and i willlifesaver you The mass percentage of water in magnesium sulfateheptahydrate, MgSO4 * 7H2O is... Ok my professor gives the answer: 51.2% ---- How is thispossible I keep getting something different... i keep getting 60%-ish Please help me answer this question...... thank you and i willlifesaver you

Explanation / Answer

i got 51.2% too here how i did it first find the mass of the whole thing as if it's 1 mole so (24.305)+(32.065)+4(16)+17(1.008*2+16) = 246.482g and then find the mass of 7H2O 7(1.008*2 +16) = 126.112g then mass of water / total mass is 126.112g / 246.482g = .5116479 times 100% to get percentage .5116479 * 100% = 51.2%       (before digit 1 is 6, so 1 becomes 2)

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