Question

Question 11 pts

**Which general statement about gases is NOT
correct?**

The molecules of a pure gas are distributed evenly throughout the container. |

Gases are much less dense than liquids or solids |

Molecules in a gas mixture can form layers according to their densities |

Gases can be compressed, even to the point of liquefaction |

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Question 21 pts

**Which example is the greatest pressure?**

1.00 atm |

101 kPa |

760 mm Hg (= 760 torr) |

All of the above pressures are equal. |

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Question 31 pts

**Which example is the greatest pressure?**

850 mm Hg (= 850 torr) |

1.5 atm |

All of the above pressures are equal. |

96 kPa |

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Question 41 pts

**Assuming all other variables are held constant, a graph
of which of the following will NOT yield a straight
line?**

P vs. V |

V vs. T |

P vs. T |

V vs. n |

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Question 51 pts

**A sealed vessel contains 0.250**
**mol** **of oxygen gas****.
Which** **of the following will result in a decrease
in the pressure of the oxygen gas?**

increasing the number of moles of oxygen |

increasing the temperature of the vessel |

increasing the volume of the vessel |

adding some helium to the vessel |

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Question 61 pts

**According to Charles’s**
**law****, which change will cause the pressure
of a gas to double? Pressure and amount of gas are
constant.**

The temperature decreases from 650 K to 325 K. |

The temperature of the sample decreases from�88 °C to 44 °C. |

The temperature of the sample increases from�22 °C to 44 °C. |

The temperature of the sample increases from�250 K to 500 K. |

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Question 71 pts

**Which set of units for**
*P***,**
*V***, and**
*T***can be used for combined gas
law calculations?**

torr, L, and Kelvins |

tm, g/L, and Kelvins |

atm, mL, and degrees Celsius |

inches of mercury, g/mL, and degrees Celsius |

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Question 81 pts

**The vapor pressure of a gas is**

the atmospheric pressure at which the boiling point is determined. |

the pressure at a Kelvin temperature exactly two times the boiling point. |

impossible to determine experimentally without knowing the temperature and volume. |

the pressure above a gas sample when evaporation and condensation are balanced. |

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Question 91 pts

**In a chemistry experiment where
CO****2** **is collected over water, the
atmospheric pressure is 755 mm. The partial pressure of water at
the temperature in the lab is 24.2 mm. What is the pressure of the
CO****2****?**

779 mm |

731 mm |

More information is needed to answer this question |

755 mm |

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Question 101 pts

**Which statement is NOT true according to the kinetic
molecular theory of gases?**

Molecules undergo elastic collisions |

Molecules move in straight-line paths. |

Molecules of different gases have different�kinetic energies at the same temperature |

Molecules occupy a negligible volume. |

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Question 111 pts

**Which statement is NOT true according to the ideal
gas law?**

At constant P & T, V must increase when n increases. |

At constant V & T, P must decrease when n decreases. |

At constant V & n, P must increase when T increases. |

At constant P & n, V must decrease when T increases |

Answer #1

11. Molecules in gas mixture can form layers according to their densities.

This statement is incorrect.

21. All of the above pressures are equal.

31. 1.5 atm is greatest pressure.

41. P vs V is not a straigth line as PV= NRT i.e P is inversely proportional to V.

51. Increasing the volume of vessel.

61. P is directly proportional to T

So when the temperature of sample increase from 250K to 500K pressure doubles.

71. Torr, L and K

81. The pressure above sample when evaporation and condensation are balanced.

Which of the following statements are true? A.The number of
moles in 1.00 atm of gas was the same, despite the fact that the
gases themselves had different identities. B.The number of moles in
1.00 atm of gas varied linearly with increasing molar mass. C.The
volume of the gas varied depending on the identity of the gas.
D.The number of moles in 1.00 atm of gas varied hyperbolically with
increasing molar mass.
Given Avogadro's Law, which of the following statements...

Chapter 5- Gases
24. As weather balloons rise from the earth's surface, the
pressure of th atmosphere becomes less, tending to cause the volume
of the balloons to exand. However, the temperature is much lower in
the upper atmosphere that at sea level. Would this temperature
effect tend to make such a balloon expand or contract? Weather
balloons do, in fact, expand as they rise. What does this tell
you?
37. Freon-12 (CF2Cl2) is commonly used as the refrigerant in...

1. Read the Chapter on Chemical Equilibrium: In particular, read
the section on the Le Chatelier Principle, as it relates to the
effects of concentration, pressure/volume, and temperature on the
position of a chemical equilibrium. 2. Solve the following related
problems involving the equilibrium between dinitrogen tetroxide and
nitrogen dioxide. N2O4 <==> 2 NO2 The equilibrium constant
for this reaction is Kp = 0.60 at 350 degrees Kelvin. A 1.0 L
vessel contains the above two gases in equilibrium at...

1. High-pressure liquid chromatography (HPLC) is a method used
in chemistry and biochemistry to purify chemical substances. The
pressures used in this procedure range from around 500 kilopascals
(500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often
convenient to know the pressure in torr. If an HPLC procedure is
running at a pressure of 2.40×108 Pa , what is its running pressure
in torr? Express the pressure numerically in torr.
2.40×108 Pa = ______ torr
2. A sample...

Consider the Ideal Gas Law, which states that PV = nRT, where P
is the pressure, V is the volume, T is the temperature, and n is
the number of moles of a gas sample, and R is a constant. (a)
Assume a sample of 1 mole of a gas is in a expandable container
where temperature and pressure are allowed to vary. Solve this
equation for V = f(P,T).
(b) Determine ∂V/dP and interpret the result. In particular,
describe...

This is a Thermodynamics course
A commonly used unit for gas pressure is torr, where 1
atmosphere = 760 torr, and 1 atmosphere is 1.01 x 105
Pascals, where a Pascal is Newtons/m2. For a pure ideal
gas at a very low pressure of 1 torr and a temperature T = 310 K,
how many molecules would be present in 1 cubic centimeter? Show
your work.
(Hint: Recall that PV = NkBT, where
N is the number of molecules, and...

Please show work and give detailed
explanation
Part 1: Determine the molar mass of Freon-11 gas if a sample
weighing 0.597 g occupies 100.0 cm3 at 95°C and 1000.0 mm Hg
A. 0.19 g/mol B. 35.3 g/mol C. 70.9 g/mol D. 137 g/mol E. 384
g/mol
Part2: A sample of N2 gas at 10.0 °C has a pressure of 543 torr.
At what temperature will it have a pressure of 450 torr if the
volume remains constant?
A. 8.33 °C...

(Q.11)A gas has a volume of 2.8 L at a temperature of 27 o C.
What temperature (o C) is needed to expand the volume to 15 L (P
and n are held constant).
(Q.12) Combined gas law problem: A balloon is filed
with 500 mL of helium at a temperature of 27 o C and 755 mm Hg. As
the balloon rises in the atmosphere, the pressure and temperature
drop. What volume will it have when it reaches an altitude...

1. Circlethecorrect(mostappropriate)statement:
a) A well-insulated house stores a lot of heat
b) The walls of a well-insulated house approximate adiabatic
boundary
c) The walls of a well-insulated house approximate diathermal
boundary
d) All of these sentences are correct
e) None of these sentences is correct
2. Consider three systems at 37oC: a 1.0L sample of H2O, 100 L
of Ne gas at 1.00bar pressure, and a small crystal of NaCl.
a) What is the thermal equilibrium status in terms of...

Weight of flask and cover 128.7g
Weight of flask with vapor 129.4g
Pressure of vapor, mm Hg 760
Pressure of, atm 1
Mass of water in flask 250g
Temperature of water in flask (boiling water) =92c
Temperature of vapor in K= 92C+273=365K
Temperature of water in the flask= 25t
the volume of vapor in the flask 250 ML
Using the volume of the flask (in liters) the temperature of the
boiling-water bath (in kelvins), and the barometric pressure (in
atmospheres),...

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