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A mixture of ethyl alcohol and propyl al...

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be

A

360

B

350

C

300

D

700

Text Solution

Verified by Experts

The correct Answer is:
B
According to Raoult.s law,
`P= P_A + p_B = p_A^@x_A + p_B^@x_B`
or `290 = p^_A^@xx(0.6) + 200 xx (1 -0.6)`
or `290 = 0.6 xx P_A^@ +0.4 xx 200 implies p_A^@ = 350 mm`
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