Question

Calculate the percentage of water of crystallisation in Na2B4O7.10H2O
[Na=23,B=11,O=16,H=1]

Answer 1

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Answer 2

Total Mass =

2*23+4*11+7*16+20*1+10*16

= 46+44+20+116+160

= 386 g

Percentage of Water

Mass of Water = 20*1 + 10*16 = 180

% = 180/386 * 100 = 0.466*100 = 46.67%