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QUESTION

# What is the equation for Dalton's law of partial pressure?

P_"Total" = P_1+P_2+.......P_n

In a gaseous mixture, the exerted by a component, is the same as the pressure it would exert if it ALONE occupied the container. The total pressure is the sum of the individual pressures. fraction of a component gas is proportional to the partial pressure.

Clearly, the total number of moles of gas is..........

n_"Total" = n_1+n_2+.......n_n

And P_"Total"=P_1+P_2.........+P_n

But given ideality, then P_i=(n_iRT)/V

So P_"Total" = (RT)/V{n_1+n_2+.......n_n}

And P_i = (n_iRT)/V = n_i/(n_1+n_2+.......n_n)xxP_"Total"

Again, P_"Total" =(n_1+n_2+n_3.........+n_n)(RT)/V

It is worthwhile spending a bit of time on the equation, and checking where you use .