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26.8 of Na2SO4 × xH2O gave 12.6 g of water on heating. The value of x in the compound is (M. mass of Na2SO4 = 142)
(A) 14 g atoms of nitrogen
(B) 0.6 moles of Sg
(C) 4 g equivalents of sulphate ions
(D) 1.2×1024 chloride ions.
Wt. of anhy. Na2SO4 = 26.8 – 12.6 = 14.2 g
14.2 g anhy. Salt combines with water = 12.6 g
142 g anhy. Salt combines with water
\ H2O (moles) = 126/18 = 7
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