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CBSE Class 11-science Answered

9.7 g of hydrate of CUSO4 loses 3.5 g of water on heating.what is the empirical formula of the hydrate?

Asked by js9600049 | 12 May, 2020, 12:56: PM
Expert Answer
When 9.7 g of CuSO4.nH2O heated it looses 3.5 g of water.
straight m subscript anhydrate equals straight m subscript hydrate minus straight m subscript water
space space space space space space space space space space space space space space equals 9.7 minus 3.5
space space space space space space space space space space space space space equals 6.2 space straight g

So comma space hydrate space contains space 6.2 space straight g space of space anhydrous space copper space sulphate.
and space 3.5 space straight g space of space water

To space calculate space empirical space formula space we space need space to space find space out space nukmber space of space straight H subscript 2 straight O space molecules space are space attached space to space CuSO subscript 4.

Number space of space moles space of space straight H subscript 2 straight O equals fraction numerator 3.5 over denominator 18 end fraction equals 0.194 space moles
Number space of space moles space of space space CuSO subscript 4 equals fraction numerator 6.2 over denominator 159.6 end fraction equals 0.0388 space moles

To space find space out space empirical space formula space after space dividing space by space lesser space number
CuSO subscript 4 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space straight H subscript 2 straight O
fraction numerator 0.0388 over denominator 0.0388 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 0.194 over denominator 0.0388 end fraction
1 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 5

So space empirical space formula space is minus space CuSO subscript 4.5 straight H subscript 2 straight O


space space space space
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