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10 April, 20:24

The volume of a gas-filled balloon is 30.0 L at 40 °C and 153 kPa pressure. What volume will the balloon have at standard temperature and pressure (273.15 K and 101.3 kPa) ?

a. 17.3 L

b. 23.7 L

c. 39.5 L

d. 51.9 L

A gas that has a volume of 28 liters, a temperature of 45 °C, and an unknown pressure, has its volume increased to 34 liters and its temperature decreased to 35 °C. If I measure the pressure after the change to be 2.0 atm, what was the original pressure of the gas?

a. 1.5 atm

b. 1.7 atm

c. 2.8 atm

d. 2.5 atm

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Answers (1)
  1. 10 April, 22:10
    0
    1.) C

    V1=30 L, T1=313.15K, P1=153kPa, V2=?, T2=273.15K, P2=101.3kPa

    PV=nRT

    (153) (30) = (n) (8.3145) (313.15)

    (4590) = (n) (2603.685675)

    n=1.7628856 moles

    (101.3) (V2) = (1.7628856) (8.3145) (273.15)

    (101.3) (V2) = (3917.023708)

    V2=38.66755882 L

    2.) D

    V1=28L, T1=318K, P1=?, V2=34L, T2=308K, P2=2.0 atm

    PV=nRT

    (2.0) (34) = (n) (.08205) (308)

    (68) = (n) (25.2714)

    n = 2.690788797 mol

    (P1) (28) = (2.690788797) (.08205) (318)

    (P1) (28) = (70.20779221)

    P=2.50742115 atm
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