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Exam 5: Gases

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Question 61

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The van der Waals equation,nRT = [P + a(n/V) ²] (V - nb) ,incorporates corrections to the ideal gas law in order to account for the properties of real gases.One of the corrections accounts for

A) the possibility of chemical reaction between molecules
B) the finite volume of molecules
C) the quantum behavior of molecules
D) the fact that average kinetic energy is inversely proportional to temperature
E) the possibility of phase changes when the temperature is decreased or the pressure is increased

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Question 62

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What volume of measured at STP is produced by the combustion of 6.27 g of natural gas according to the following equation?

A) 8.76 L
B) 17.5 L
C) 4.38 L
D) 19.1 L
E) 3.14 L

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Question 63

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The diffusion of a gas is faster than the effusion of a gas.

The pressure a gas would exert under ideal conditions is always greater than the observed pressure of a real gas.

Which of the following properties of a real gas is related to the b coefficient in the van der Waals equation?

Which of the following statements is true concerning ideal gases?

Body temperature is about 309 K.On a cold day,what volume of air at 276 K must a person with a lung capacity of 2.2 L breathe in to fill the lungs?

Standard pressure for gases is

A 142-mL sample of gas is collected over water at 22°C and 753 torr.What is the volume of the dry gas at STP? (The vapor pressure of water at 22°C = 20.torr)

Gases generally have

What volume does 40.5 g of N₂ occupy at STP?

Calculate the ratio of the effusion rates of N₂ and N₂O.

Zinc metal is added to hydrochloric acid to generate hydrogen gas,which is collected over a liquid whose vapor pressure is the same as pure water at 20.0°C (18 torr) .The volume of the gas mixture is 1.7 L and its total pressure is 0.810 atm. -Determine the number of moles of hydrogen gas present in the sample.

What volume of carbon dioxide measured at STP will be formed by the reaction of 1.47 mol of oxygen with 0.900 mol of ethyl alcohol,CH₃CH₂OH?

Into a 2.22-liter container at 25°C are placed 1.23 moles of O₂ gas and 3.20 moles of solid C (graphite) .If the carbon and oxygen react completely to form CO(g) ,what will be the final pressure in the container at 25°C?

The valve between the 2.00-L bulb,in which the gas pressure is 1.80 atm,and the 3.00-L bulb,in which the gas pressure is 3.00 atm,is opened.What is the final pressure in the two bulbs,the temperature remaining constant?

Calcium hydride combines with water according to the equation: Beginning with 84.0 g of CaH₂ and 42.0 g of H₂O,what volume of H₂ will be produced at 273 K and a pressure of 1327 torr?

Zinc metal is added to hydrochloric acid to generate hydrogen gas,which is collected over a liquid whose vapor pressure is the same as pure water at 20.0°C (18 torr) .The volume of the gas mixture is 1.7 L and its total pressure is 0.810 atm. -Determine the partial pressure of the hydrogen gas in this mixture.

You are holding two balloons,an orange balloon and a blue balloon.The orange balloon is filled with neon (Ne) gas and the blue balloon is filled with argon (Ar) gas.The orange balloon has twice the volume of the blue balloon.Which of the following best represents the mass ratio of Ne:Ar in the balloons?

Which of the following would have a higher rate of effusion than C₂H₂?