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Calculate the concentration in g/litre o...

Calculate the concentration in g/litre of "20 volume" solution of hydrogen peroxide.

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A 20 volume solution of hydrogen peroxide means that 1 litre of the solution gives 20 litres of oxygen at STP.According to its decomposition reaction,
`underset(2 xx 34 g = 64 g)(2H_2O_2) to 2H_2O + underset(22.4 L at STP)(O_2)`
1 litre of hydrogen peroxide gives 20 L of oxygen at STP, therefore, 22.4 L of oxygen is obtained from `(2 xx 34g) = 68 g.`
20 L of oxygen at S.T.P. is obtained from = `(68 xx 20)/(22.4) = 60.71 g`
Thus, 1 L of sample contains `H_2O_2 = 60.71 g`
`therefore` Strength of the 20 volume solution of hydrogen peroxide is `60.71 g L^(-1)`
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