The crystallisation salt Na2So4.xH2O on heating losses 55.9% of its weight . The formula of the crystalline salt is

Asked by vikasg13.hardware | 11th Nov, 2017, 01:46: PM

Expert Answer:

In space 100 space straight g space of space Na subscript 2 SO subscript 4. xH subscript 2 straight O space space the i r space is space 55.9 space straight g space of space water.
mole space proportion space is space 100 minus 55.9 equals 44.10
Na subscript 2 SO subscript 4 equals 44.10
space space space space space space space space space space space space equals space space space space fraction numerator 44.10 over denominator 142 end fraction
space space space space space space space space space space space space space equals space space 0.3106

space space space straight H subscript 2 straight O space equals space 55.9
space space space space space space space space space space space equals fraction numerator 55.9 over denominator 18 end fraction
space space space space space space space space space space space space space equals 3.1
therefore space We space will space have space the space mole space proportion space as space Na subscript 2 SO subscript 4 space colon space straight H subscript 2 straight O space equals space 0.3 space colon space 3
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 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 space space equals 1 colon 10

Hence space 10 space water space molecules space are space there.
Te space molecular space formula space is space Na subscript 2 SO subscript 4.10 straight H subscript 2 straight O

Answered by Varsha | 11th Nov, 2017, 02:33: PM

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