Question

What is the total pressure if an anaesthetic gas is delivered at `330*mm*Hg` pressure?

Answer 1

The question is not well-proposed....

Explanation:

If an anaesthetic gas is administered, unless you are in a hyperbaric chamber (for instance after a diving emergency) the total pressure is `1*atm`, i.e. enough to support a `760*mm*Hg` column.

The sum of the individual partial pressures of whatever gases you are inhaling is thus `1*atm`. On this basis, the partial pressure of oxygen is `430*mm*Hg` `~=0.6*atm`,

However, this question proposes that a total pressure of `760*mm*Hg" (dioxygen)"+330*mm*Hg" (cyclopropane)"` is administered. This is not the way that anaesthetic gases are administered; the total pressure must be atmospheric, and the individual partial pressures after they exit the regulator on the tank sum to one atmosphere.