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A mixture of CS2(g) and excess O2(g) is placed in a 1.0 L reaction vessel at 100.0 °C and a total pressure of 3.00 atm. The CS2 is ignited and it burns according to the balanced equation below. After the reaction, the vessel is cooled to 100.0 °C and the pressure of the mixture of product gases (O2(g), CO2(g), and SO2(g)) is 2.40 atm. What is the partial pressure of SO2 in the mixture?