Question

calculate the number of moles in 17 gm of H2O2(atomic weight of H=1u,O=16u)

Answer 1

1 no mole of H2O2 is 34 gm
Hence 17 gm of it will have 0.5 moles.
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Answer 2

Given:

Mass of $H_2O_2$ = 17gm

To find:

Number of moles in 17gm of $H_2O_2$

Formula to be used:

$Number of moles = \frac{Given mass}{Molar mass}$

Calculation:

Molar mass of $H_2O_2$ = 2(1)+2(16) = 2+32= 34

$Number of moles = \frac{Given mass}{Molar mass}$

$Number of moles = \frac{17}{34}$

$Number of moles = 0.5$

Conclusion:

17gm of $H_2O_2$ contains 0.5 moles.

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