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Exam 10: Gases: Their Properties and Behavior

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Question 21

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How many molecules of N₂ are in a 300.0 mL container at 780 mm Hg and 135°C?

A) 5.26 × 10^{21 molecules}
B) 5.54 × 10^{21 molecules}
C) 1.59 × 10^{22 molecules}
D) 1.67 × 10^{22 molecules}

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Question 22

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You have two samples of the same gas in the same size container,with the same pressure.The gas in the first container has a Kelvin temperature four times that of the gas in the other container.The ratio of the number of moles of gas in the first container compared to that in the second is

A) 1:1.
B) 1:2.
C) 1:4.
D) 4:1.

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Question 23

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Which of the following is equivalent to 1 atm pressure?

In the diagram below,nitrogen molecules are represented by unshaded spheres,oxygen molecules by gray spheres,and chlorine molecules by black spheres. -If the total pressure in the container is 100.mm Hg,what is the partial pressure of chlorine?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain compressibility of a gas?

If CO₂ and NH₃ are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH₃ will be ________ times that of CO₂.

-What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure,P_atm,is 740 mm Hg and the difference in mercury levels,Δh,is 30 mm Hg?

If NO₂ and NH₃ are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH₃ will be ________ times that of CO₂.

Assume that you have a sample of gas in a cylinder with a moveable piston,as shown in diagram (1) .The initial pressure,number of moles,and temperature of the gas are noted on the diagram.Which diagram (2) -(4) most closely represents the result of doubling the pressure and number of moles of gas while keeping the temperature constant?

The region of the atmosphere that is closest to the earth's surface is the ________.

A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish. -Which drawing best shows the approximate level of the mercury in the tube when a vacuum pump is connected to the top of the tube,the stopcock opened,the tube is evacuated,the stopcock is closed,and the pump is removed?

According to the kinetic molecular theory of gases,at 290 K the average kinetic energy of O₂ is ________ the average kinetic energy of NO₂.

How many liters of oxygen are needed to exactly react with 55.6 g of methane at STP? CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(l)

If the Earth's ozone (O₃) layer has a total volume of 1.00 × 10²⁰ km³,a partial pressure of 1.6 × 10^-9 atm,and an average temperature of 230 K,how many ozone molecules are in the Earth's ozone layer?

A gas bottle contains 0.800 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

A gas occupies 22.4 L at STP and 9.85 L at 100.°C and 2.00 atm pressure.How many moles of gas did the system gain or lose?

Which of the following gases has the lowest average speed at 25°C?

One mole of gas at 25°C has a ________ volume than one mole of gas at standard temperature.

A basketball is inflated to a pressure of 1.80 atm in a 23.0°C garage.What is the pressure of the basketball outside where the temperature is -2.00°C?

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains flask B contains SO₂,and flask C contains He_. Which flask contains the largest number of molecules?