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Exam 9: Gases: Their Properties and Behavior

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Question 41

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When temperature-volume measurements are made on 1.0 mol of gas at 1.0 atm,a plot V versus T results in a

A) hyperbola.
B) parabola.
C) sine curve.
D) straight line.

E) B) and D)
F) C) and D)

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Question 42

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Which of the following would have a density of 1.21 g/L at 7.0°C and 0.987 atm?

A) Ar
B) N₂
C) Ne
D) O₂

E) A) and B)
F) All of the above

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Question 43

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In a flask containing 2.00 mol of He,3.00 mol of Ne,and 5.00 mol of Ar at STP the partial pressure of He is ________ mm Hg.

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

Which of the following instruments directly measures the pressure of a gas?

A 10.0-L flask containing He,2.00 mole of Ar,and 3.00 mole of Ne has a total pressure of 24.5 atm at 25°C.How many moles of He are in the flask?

What is the temperature of NO₂ gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?

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

The apparatus shown is called a closed-end manometer because the arm not connected to the gas sample is closed to the atmosphere and is under vacuum. -What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure,P_atm,is 750 mm Hg and the difference in mercury levels,Δh,is 25 mm Hg?

The pressure in the eye of a hurricane is less than atmospheric pressure.Which one of the following pressure readings could not have been taken in the eye of a hurricane?

A 1.000 kg sample of nitroglycerine,C₃H₅N₃O₉,explodes and releases gases with a temperature of 1985°C at 1.000 atm.What is the volume of gas produced? 4 C₃H₅N₃O₉(l) → 12 CO₂(g) + 10 H₂O(g) + 6 N₂(g) + O₂(g)

To two significant figures,by what factor will the pressure of an ideal gas change if the temperature of the gas is changed from 100°C to 200°C?

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?

Which of the following regions of the earth's atmosphere is closest to the surface of the earth?

Which of the following gases has the highest average speed at 400K?

How many molecules of N₂ are in a 400.0 mL container at 780 mm Hg and 135°C?

Effusion of a 1:1 mixture of two gases,represented by unshaded and shaded spheres in the diagram below,through a small pinhole produces the result shown below.The shaded spheres have a molecular mass of 32 amu.Which gas molecules have the higher average speed and what is the molecular mass of the unshaded molecules?

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains C₂H₄,flask B contains O₃,and flask C contains F₂.Which flask contains the largest number of molecules?

Under the same pressure and temperature conditions,the level of water inside a barometer will be ________ than the level of mercury inside the barometer by a factor equal to the ratio of the density of ________ over the density of ________.

If 1.0 gram each of Cl₂,CO₂,N₂,and O₂ are contained in a 5-L flask,the gas with the highest partial pressure is ________.