Question- A) An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 4.00 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?
B) A 9.80-L container holds a mixture of two gases at 27 °C. The partial pressures of gas A and gas B, respectively, are 0.204 atm and 0.628 atm. If 0.250 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
C) A gas mixture is made by combining 6.4 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 15.17 L.What is the molar mass of the unknown gas? Identify the unknown gas.
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