Question

at 25 C, the total partial pressure of an ideal solution obtained by mixing 3 moles of A and 2 moles of B is 184 torr. what is the vapour pressure of B at same tempreature?

Answer 1

Answer:

73.6 torr

Explanation:

This is based on the Dalton's law of partial pressure. It states the total pressure is the sum of partial pressure of all gas.

suppose we have n numer of gases

$P_total= p_1+p_2+p_3+... +p_n$

where partial pressure depends on the mole fraction $p_i= P_total*x_i$

where i is any gas from the mixture of gases.

And xi is the mole fraction of gas

So in question we have

total number of moles=5

number of B gas=2

mole fraction of gas= 2/5

so the partial pressure will be

2/5*184=73.6 torr