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Hydrogen Peroxide

How many mole...

Question

How many moles of $H_{2} O_{2}$ are present in 2 litres of 6.8% w/v $H_{2} O_{2}$ solution?

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Solution

$6.8$ % (w/v)= $\frac{6.8 g o f H_{2} O_{2}}{100 m l o f w a t e r} \times 100$
$∴$ In $2$ litres, $6.8 \times 2 \times 10 g$ of $H_{2} O_{2}$ will be present.
$∴$ Mass of $H_{2} O_{2} = 6.8 \times 2 \times 10 = 136 g$

$∴$ Moles of $H_{2} O_{2} = \frac{136}{34} = 4$ moles

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