PROBLEM 74P

A gas mixture contains each gas at the indicated partial pressure.

CO2 |
422 mm Hg |

Ar |
102 mm Hg |

O2 |
165 mm Hg |

H2 |
52 mm Hg |

What is the total pressure of the mixture?

Solution 74P

The partial pressure of helium is 185 Torr.

This problem involves Dalton's Law of Partial Pressures.

For your problem, we can write this as

Ptotal=PCO₂+PAr+PO₂+PHe

745 Torr = 135 Torr + 234 Torr + 191 Torr + PHe = 560 Torr + PHe

PHe = 745 Torr – 560 Torr = 185 Torr