Question

What does Dalton's law of partial pressure mean?

Answer 1

It means we can solve problems like this one.

Explanation:

And in a gaseous mixture, the partial pressure exerted by a component gas is the same as the pressure it would exert if that component ALONE had occupied the container. The total pressure is the sum of the individual partial pressures.

`P_"Total"` `=` `P_1 +P_2+P_3+................+P_n`

But if we assume ideality, then `P=(nRT)/V`

And thus,

`P_"Total"` `=` `(n_1RT)/V+(n_1RT)/V.............(n_nRT)/V`

`=` `(RT)/V{n_1+n_2+................n_n}`

`=` `(RT)/V*Sigman_i`, where `n_i` is the amount in moles of each particular gas.

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