Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 125 mmhg; ar, 214 mmhg; and o2, 187 mmhg. the mixture also contains helium gas. what is the partial pressure of the helium gas? what mass of helium gas is present in a 12.0-l sample of this mixture at 273 k?

Explanation:

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By applying the Dalton's law, we can compute the partial pressure of the helium has:

Now, solving for the partial pressure of the helium gas we get:

On the other hand, the mass of the helium gas is computed via the ideal gas equation in terms of the helium's mass:

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