Question -
Ordinary water contains one part of heavy water per 6000 parts by weight.The number of heavy water molecules present in a drop of water of volume 0.01 ml is (Density of water is 1 g/ml)
Options:
A .  2.5 × 1016
B .  2.5 × 1017
C .  5 × 1016
D .  7.5 × 1016
Answer: Option C : C H2O6000D2O1 0.01 x x=1×0.016000=1.66×10−6 20gm→6.023×1023 1.66×10−6→x x=1.66×10−6×6.023×102320=5×1016
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