Question

1. A sample of methane gas (CH4) at 24.4 oC is either heated or cooled. The pressure increases from 1.21 atm to 3.80 atm, and the volume of the sample changes from 1.02 L to 4.61 L. To what temperature, in oC, was the methane heated or cooled?

2. An effusion container is filled with 5 L of an unknown gas. It takes 321 s for the gas to effuse into a vacuum. From the same container under the same conditions--same temperature and initial pressure, it takes 124 s for 5.00 L of O2 gas to effuse. Calculate the molar mass (in grams/mol) of the unknown gas.

3. Three bulbs are connected by tubing, and the tubing is evacuated. The volume of the tubing is 39.0 mL. The first bulb has a volume of 56.0 mL and contains 5.92 atm of argon, the second bulb has a volume of 250 mL and contains 1.28 atm of neon, and the third bulb has a volume of 37.0 mL and contains 8.50 atm of hydrogen. If the stopcocks (valves) that isolate all three bulbs are opened, what is the final pressure of the whole system in atm?

Answer #1

Charles's Law:
a.) A sample of krypton gas at a pressure of 1.02 atm and a
temperature of 167 oC, occupies a volume of 587 mL. If
the gas is heated at constant pressure until its volume is 849 mL,
the temperature of the gas sample will be
__________oC.
b.) A sample of methane gas at a pressure of 683 mm Hg and a
temperature of 79 oC, occupies a volume of 13.4 liters.
If the gas is cooled at...

A sample of methane gas at a pressure of
0.633 atm and a temperature of 296
°C, occupies a volume of 699 mL. If the
gas is cooled at constant pressure until its
volume is 599 mL, the temperature of the gas
sample will be ________ °C.
A sample of oxygen gas at a pressure of
0.538 atm and a temperature of 283
°C, occupies a volume of 500 mL. If the
gas is heated at constant pressure until its...

1a. A sample of methane gas at 292 K and 0.160 atm occupies a
volume of 2.06 L. If the pressure of the gas is increased, while at
the same time it is heated to a higher temperature, the final gas
volume
a. will be smaller than 2.06 L.
b. will be larger than 2.06 L.
c. could be larger or smaller than 2.06 L depending on the final
pressure and temperature.
1b. A sample of oxygen gas at 300...

A sample of krypton gas at 287 K and 0.808 atm occupies a volume
of 4.78 L. If the gas is compressed into a smaller volume, while at
the same time it is heated to a higher temperature, the final gas
pressure will be lower than 0.808 atm. could be higher or lower
than 0.808 atm depending on the final volume and temperature. will
be higher than 0.808 atm.
A sample of xenon gas at 310 K and 0.563 atm...

1(a) Effusion refers to the process that gas molecules are
escaped from a container through a small pin hole. The rate of
escape is determined by their root-room-square speed
urms. Effusion is used enrich radioactive uranium
235U from the non-radioactive 238U element.
Explain how this is possible.
(b) If the rate of effusion of A is four times the rate of B,
how does the molar mass of A related to molar mass B?
(c ) If an unknown gas...

A weather balloon contains 222 L of He gas at 20. °C and 760.
mmHg. What is the volume of the balloon when it ascends to an
altitude where the temperature is -40. °C and 540. mmHg?
1
What volume does 12.5 g of Ar gas at a pressure of 1.05 atm and
a temperature of 322 K occupy? Would the volume be different if the
sample were 12.5 g of He gas under the same conditions?
How many moles...

1. A sample of methane gas at a pressure of
836 mm Hg and a temperature of 84
°C, occupies a volume of 8.51 liters. If
the gas is cooled at constant pressure to a
temperature of 45 °C, the volume of the gas sample
will be L.
2. The average molecular speed in a sample of Xe gas at a
certain temperature is 238 m/s.
The average molecular speed in a sample of NH3 gas is m/s at the...

A mixture of methane gas, CH4(g), and pentane gas, C5H12(g), has
a pressure of 0.5015 atm when placed in a sealed container. The
complete combustion of the mixture to carbon dioxide gas, CO2(g),
and water vapor, H2O(g), was achieved by adding exactly enough
oxygen gas, O2(g), to the container. The pressure of the product
mixture in the sealed container is 2.421 atm. Calculate the mole
fraction of methane in the initial mixture assuming the temperature
and volume remain constant. Xch4=

1a/ A sample of xenon gas at a pressure of
0.679 atm and a temperature of 282
°C, occupies a volume of 569 mL. If the
gas is cooled at constant pressure until its
volume is 476 mL, the temperature of the gas
sample will be (........) °C.
1b/ A sample of nitrogen gas at a pressure of
876 mm Hg and a temperature of 26
°C, occupies a volume of 10.1 liters. If
the gas is heated at constant...

A small gas cylinder containing CH4 (methane) gas is found to
have a mass of 246.776g, and is used to bubble methane into a
container that has been submerged in 22.0 C water. The volume of the gas that is
inside the container at the end is 0.228L, and the gas cylinder
weighs 246.622g. The barometric pressure of the room is
1.05atm.
1. Calculate the mass of CH4 that was released into the
container.
2. Calculate the temperature of the...

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