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Exam 5: Gases

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Question 51

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A sample of nitrogen gas has a volume of 160.0 mL at STP. What volume does the gas occupy if the absolute temperature and pressure are each quadrupled?

A) 40.00 mL
B) 640.0 mL
C) 400.0 mL
D) 89.60 L
E) 160.0 mL

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Question 52

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An excess of potassium hydroxide is treated with 1.4 L of dry hydrogen bromide gas measured at STP. What is the mass of potassium bromide formed?

A) 9.4  10² g
B) 7.4 g
C) 1.2  10³ g
D) 1.9  10³ g
E) 1.6  10³ g

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Question 53

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Volume versus temperature in degrees Celsius for an ideal gas at constant volume and number of moles Which graph represents the plot?

The root-mean-square velocity of CO gas at 15°C is

Four identical 1.0-L flasks contain the gases He, Cl₂, CH₄, and NH₃, each at 0°C and 1 atm pressure. -Which gas sample has the greatest number of molecules?

Calculate the following ratios for a gas at Kelvin temperatures T₁ and T₂ where T₂ = 2T₁. -Mean free path at T₁ : Mean free path at T₂

Calculate the following ratios for a gas at Kelvin temperatures T₁ and T₂ where T₂ = 2T₁. Average kinetic energy at T₁ : Average kinetic energy at T₂

Consider three 1-L flasks at the same temperature and pressure. Flask A contains CO gas, flask B contains N₂ gas, and flask C contains O₂ gas. In which flask do the molecules have the greatest momentum per impact?

Into a 3.90-liter container at 23°C are placed 1.18 mol of O₂ gas and 4.02 mol 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 23°C?

Consider separate samples of Ar(g) and Ne(g) . For what ratio of absolute temperatures (Ne:Ar) are the average kinetic energies equal?

Three 1.00-L flasks at 25°C and 725 torr contain the gases CH4 (flask A) , CO2 (flask B) , and C2H6 (flask C) . In which single flask do the molecules have the greatest mass, the greatest average velocity, and the highest kinetic energy?

Calculate the ratio of the change in momentum per wall impact for Ar(g) to that for He(g) if the gases are at the same temperature and pressure.

Consider three 1.0-L flasks at STP. Flask A contains N₂ gas, flask B contains Kr gas, and flask C contains He gas. In which flask do the gas particles have the lowest average kinetic energy?

A vessel with a volume of 10.2 L contains 3.12 g of nitrogen gas, 0.590 g of hydrogen gas, and 82.4 g of argon gas. At 25.4°C, what is the pressure in the vessel?

Consider two 1.0-L containers, one containing He(g) at 2.50 atm and 24°C and the other containing Ar(g) at 5.00 atm and 48°C. -Calculate the ratio of impacts with the wall per second (He:Ar) .

Calculate the temperature at which the average velocity of Ar(g) equals the average velocity of Ne(g) at 25°C.

If a 2.15-g sample of a gas occupies 750. mL at STP, what is the molar mass of the gas at 125°C?

Samples of the gases H₂(g) and SO₂(g) have equal masses and are at the same temperature and pressure. Calculate the following: The ratio of volumes .

A 3.54-g sample of lead(II) nitrate, Pb(NO₃) ₂, molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 1.60 L. The salt decomposes when heated, according to the equation 2Pb(NO₃) ₂(s)  2PbO(s) + 4NO₂(g) + O₂(g) Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300. K? Assume the PbO(s) takes up negligible volume.

Order the following according to increasing rate of effusion: F₂, Cl₂, NO, NO₂, CH₄