Question

A mixture of the gases N2, O2, and He has a total pressure of 760 mm Hg. If the partial pressure of N2 is 90 mm Hg and of O2 is 270 mm Hg, what is the partial pressure of He?

Answer 1

Answer: The partial pressure of Helium is 400 mm Hg.

Step-by-step explanation:

According to Dalton's law, the total pressure is the sum of individual pressures of all the gases present in the system.

`p_(total)=p_1+p_2`

`p_(total)=p_(N_2)+p_(O_2)+p_(He)`

given :

`p_(total)=760mmHg`

`p_(N_2)=90mmHg`,

`p_(O_2)=270mmHg`

Putting in the values we get:

`760mmHg=90mmHg+270mmHg+p_(He)`

`p_(He)=400mmHg`

Thus the partial pressure of Helium is 400 mm Hg.