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CuSO(4) .5H(2)O((g)) hArr CuSO(4), 3H(2)...

`CuSO_(4) .5H_(2)O_((g)) hArr CuSO_(4), 3H_(2)O_((s)) + 2H_(2) O_((g)) , K_(p) = 4 xx 10^(-4) atm^(2)`. If the vapour pressure of wateris 38 torr then percentage of relative humidity is: (Assume all data at constant temperature)

A

4

B

10

C

40

D

1

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(P)=P_(H_(2)O)^(2)`
`= sqrt(K_(P))=2 xx 10^(-2)` atm, `2 xx 10^(-2) xx 760` mm
`% R.H=(P_(H_(2)O))/("vapour pressure of" H_(2)O) xx 100`
`=(2 xx 10^(-2) xx 760)/(38) xx 100=40%`
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