Question

What is the percent composition of water in the compound magnesium sulfate heptahydrate, MgDO4•7H2O?

A. 7.3%
B. 24.8%
C. 48.8%
D. 51.2%

Answer 1

Answer:51. 2%

Explanation:

24+32+(16×4)+7(2+16)=24+32+64+126=246

26g of Epsom salt contains 126g of water of crystallisation.Hence, 100g of Epsom salt contains 100×126/246The % of H2​O in MgSO4​.7H2​O=