Question

How many moles of H2O will be produced from 42.0g of H2O2

Answer 1

Answer : The number of moles of water will be, 1.235 moles

Solution : Given,

Mass of $H_2O_2$ = 42 grams

Molar mass of $H_2O_2$ = 34 g/mole

First we have to calculate the moles of $H_2O_2$

$\text{Moles of }H_2O_2=\frac{\text{Mass of }H_2O_2}{\text{Molar mass of }H_2O_2}=\frac{42g}{34g/mole}=1.235moles$

Now we have to calculate the moles of water.

The balanced chemical reaction will be,

$2H_2O_2\rightarrow 2H_2O+O_2$

From the balanced reaction, we conclude that

As, 2 moles of $H_2O_2$ decomposes to give 2 moles of water

So, 1.235 moles of $H_2O_2$ decomposes to give 1.235 moles of water

Therefore, the number of moles of water will be, 1.235 moles