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[SUBJECT - CHEMISTRY]

QUESTION:-
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The crystalline salt Na2SO4.xH2O on heating loses 55.9% of its weight. The formulae of the crystalline salt is
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Answer 1

molar mass of salt = (2×23)+32+( 16×4)+ x ×18
142+18x
mass by mass % = mass by molar mass of compound × 100
mass of water 18x
55.9=( 18x/142 + 18x )× 100
55.9(142 + 18x ) = 1800x
x= 9.99
x= 10 max.
molecular compound = NA2so4.10h2o.

Answer 2

molar mass of salt = (2×23)+32+( 16×4)+ x ×18

142+18x

mass by mass % = mass by molar mass of compound × 100

mass of water 18x

55.9=( 18x/142 + 18x )× 100

55.9(142 + 18x ) = 1800x

x= 9.99

x= 10 max.

molecular compound = NA2so4.10h2o

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