Question

The total pressure of a mixture of co2 and o2 is 780 mmhg. if the pressure of the co2 is 560. torr, what is the pressure of o2?

Answer 1

when the total pressure equal sum of all the partial pressure with the same units.

and when we have total pressure = 780 mmHg = 780 torr

So total pressure = P(CO2) + P(O2)

by substitution:

780 torr = 560 torr + P(O2)
∴P(O2) = 780 torr - 560 torr
             = 220 torr