Question

At constant temperature 200cm^3 of N2 at 720mm and 400cm3 of O2 at 750mm pressure are put together in a one litre flask.the final pressure of mixture is????????

Answer 1

Answer : The final pressure of the mixture is, 444 mm

Solution :

Formula used :

$PV=P_1V_1+P_2V_2\\\\P=\frac{P_1V_1+P_2V_2}{V}$

where,

P = final pressure of the mixture

V = final volume of the mixture = 1 L

$P_1$ = pressure of $N_2$ = 720 mm

$P_2$ = pressure of $O_2$ = 750 mm

$V_1$ = volume of $N_2$ = =$200cm^3=0.2L$

$V_2$ = volume of $O_2$ = =$400cm^3=0.4L$

Now put all the given values in the above formula, we get the the final pressure of the mixture.

$P=\frac{(720mm\times 0.2L)+(750mm\times 0.4L)}{1L}=444mm$

Therefore, the final pressure of the mixture is, 444 mm