A mixture of 3 gases is made of nitrogen (pressure of 905 torr), oxygen (pressure of 450 mm Hg) and argon (pressure of 2.75 atm). What is the total pressure of the mixture in atmospheres?

Answer 1

You need to convert torr and mm Hg to atmospheres. There are 760 torr and 760 mm Hg in one atmosphere.

Nitrogen: 905 torr = 905 torr/ 760 torr/atm = 1.19 atm

Oxygen: 450 mm Hg = 450 mm Hg / 760 mmHg/atm = 0.59 atm

Argon: 2.75 atm

The total pressure is the sum of the pressures in atmospheres for each gas.

answer = 4.53 atm.