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CBSE Class 11-science Answered

13.4g of a sample of unstable hydrated salt : Na2So4.xH2O was found to contain 6.3g of water. Determine the number of water of crystallisation.
Asked by dineshchem108 | 14 Jul, 2018, 07:46: PM
answered-by-expert Expert Answer
The space molar space mass space of space the space salt space is space straight m left parenthesis Na subscript 2 SO subscript 4. xH subscript 2 straight O right parenthesis space equals space 2 cross times 23 plus 32 plus 16 cross times 4 plus straight x left parenthesis 2 plus 16 right parenthesis equals 142 plus straight x cross times 18 fraction numerator wt. space of space water over denominator wt. of space sample end fraction equals fraction numerator wt. space of space water space in space the space compound space over denominator mol. space wt. space of space the space compound end fraction fraction numerator 6.3 over denominator 13.4 end fraction equals fraction numerator straight x space cross times 18 over denominator 142 space plus 18 straight x end fraction 13.4 cross times 18 straight x space equals space left parenthesis 142 space plus 18 straight x right parenthesis cross times 6.3 241.2 straight x space equals space 894.6 space plus space 113. straight x 127.8 straight x space equals space 894.6 straight x space equals 7
Answered by Ramandeep | 14 Jul, 2018, 08:10: PM

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