1.

A sample of H_(2)O_(2) solution labelled as "28 volume" has density of 26.5 g/L. Mark the correct option(s) representing concentration of same solution in other units

Answer»

`M_(H_(2)O_(2))=2.5`
`% W/V=17`
Mole fraction of `H_(2)O_(2)=0.2`
m`m_(H_(2)O_(2))=13.88`

Solution :`V_("strength"=56`'
`:. M=28/11.2 =2.5`
`:.` 1 L contain 2.5 moles of `H_(2)O_(2)`
or `2.5xx34=85 g H_(2)O_(2)`
wt. of 1 litre solution `=265 g""( :' d=265 g//L)`
`:. w_(H_(2)O)=180 g`
or
number of moles of `H_(2)O=180/18=10`
`x_(H_(2)O_(2))=2.5/(2.5+10)=0.2`
`% w/v=(2.5xx34)/1000xx100=8.5`
`m=2.5/180xx1000=13.88`.


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