PRACTICE MULTIPLE CHOICE QUESTIONS FROM UNIT 10

1.) A cylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon, and 5.00 moles of helium.  If
     the gas mixture is at STP, what is the partial pressure of the argon?
        (A) 152 torr        (B) 228 torr        (C) 380. torr        (D) 760. torr

2.) Compared to the average kinetic energy of 1 mole of water at 0 oC, the average kinetic energy
     of 1 mole of water at 298 K is
        (A) the same, and the number of molecules is the same
        (B) the same, but the number of molecules is greater
        (C) greater, and the number of molecules is greater
        (D) greater, but the number of molecules is the same

3.) If the pressure on a given mass of gas in a closed system is increased and the temperature
     remains constant, the volume of the gas will
        (A) decrease        (B) increase        (C) remain the same

4.) Which gas has approximately the same density as C2H6 at STP?
        (A) NO        (B) NH3        (C) H2S        (D) SO2

5.) At a temperature of 273 K, a 400. milliliter gas sample has a pressure of 760. millimeters of
     mercury.  If the pressure is changed to 380. millimeters of mercury, at which temperature will
     this gas sample have a volume of 551 milliliters?
        (A) 100 K        (B) 188 K        (C) 273 K        (D) 546 K

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