Question

Calculate the number of moles in 17gm of H2O2.(Atomic weight of H=1u,O=16u)

Answer 1

given mass =17
molar mass =. 1×2+16×2=34
no. of moles in 17 gm =17/34=0.5moles
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Answer 2

Atomic mass of H = 1 

Atomic mass of O = 16 

Molecular mass of H2O2= (2 × 1) + (2 × 16) = 34 gm 

Since 34 gm of hydrogen peroxide (H2O2) = 1 mole 

Hence 17 gm of H2O2 = 1/ 34 ×17 = 1/ 2 = 0.5moles