Natural gas wells are not the only source of gases emerging from the earth. Volcanoes, for example, are a naturally occurring source of various gases. A scientist tries to generate a mixture of gases similar to those found in a volcano by introducing 15.0 g of water vapor, 3.5 g of SO₂, and 1.0 g of CO₂ into a 40.0-L vessel held at 120.0°C. Calculate the partial pressure of each gas and the total pressure.

Strategy As usual, we will begin by assuming that all the gases behave ideally. Then we can treat each gas separately to determine its partial pressure. Finally, sum these partial pressures to calculate the total pressure.