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A 350.0 mL sample of oxygen gas was collected over water at a temperature of 25ºC and 740.0 mm Hg. How many moles of gas were there in this sample if the vapor pressure of water at 25ºC is 23.8 mm Hg?

If a chemistry student collected 834 mL of gas at 25ºC and 8.00 x 102 torr, how many moles did she collect?

PLEASE HELP NEED ANSWER What is the density in g/L of chlorine gas at 7.50 x 102 torr and 25.0ºC? (Molar mass of chlorine = 70.9 g/mol.)