Q.

A certain hydrate has the formula MgSO4.xH2O. A quantity of 54.2 g of the compound is heated in an oven to drive off the water. If the steam generated exerts a pressure of 24.8 atm in a 2.0 L container at 120°C, calculate x.

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a

2

b

5

c

6

d

7

answer is D.

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Detailed Solution

nH2O=PVRT=1.54nMgSO4×H2OnH2O=1x=54.2(120+18x)×1.54x=7
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A certain hydrate has the formula MgSO4.xH2O. A quantity of 54.2 g of the compound is heated in an oven to drive off the water. If the steam generated exerts a pressure of 24.8 atm in a 2.0 L container at 120°C, calculate x.