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Question Q129) The total number of electrons in 3 g of KH to that in 1.8 g of H2O



SOLUTION

Molecular mass of KH=29+1=30g
3g of = 0.1 mole
One molecule of KH have 19+1= 20 electrons
∴ 0.1 mole of KH have = 0.1×20 =2 mole of electrons
Molecular mass of H2O= 2(1)+16 =18g
1.8g =0.1 mole
One molecule of H2O have 2(1)+8 = 10 electron
0.1 mole of H2O have = 0.1×10 = 1 mole electrons
The total number of electrons in 3 g of KH to that in 1.8 g of H2O is double
Answer : (a)