A 21.0-liter gas cylinder contains 7.6 moles of nitrogen gas and 3.4 moles of oxygen gas. If the temperature of inside the cylinder is 0 °C, what is the total pressure inside the cylinder?

Answer 1

Ideal gases are indistinguishable except with mass and properties that depend on mass (like density). Mixtures of gases can be treated as one gas with regard to IGL or other gas laws:

IGL for the mixture of gases is P_TotV = n_TotRT and P_Tot = n_TotRT/V where Tot means total

P_Tot is sum of partial pressures and n_Tot is sum of the moles

P_T = (7.6+3.4 moles)(.0821)(2175.15 K)/(21.0 liters)

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