1.

What volume of aqueous solution of NaOH that is 80% by mass NaOH, contanis 0.4 mol of NaOH. Density of solution is 0.8 gm//ml.

Answer»

`8 ml`
25 ml
16 ml
250 ml

SOLUTION :`0.4 " mole " NaOH = 0.4 xx 40 = 16 GM`
`80%` by MASS NaOH
`80 gm NaOH` in 100 gm solution
16 gm NaOH in 20 gm solution
Volume of solution `(V) = (m)/(d) = (20)/(0.8) = 25 ml`


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