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Exam 10: Gases

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Question 41

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A balloon originally had a volume of 4.39 L at 44 °C and a pressure of 729 torr. The balloon must be cooled to °C to reduce its volume to 3.78 L (at constant pressure)

A) 546
B) 72.9
C) 273
D) 38
E) 0

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Question 42

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The volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62 °C. The gas is .

A) Ne
B) NH₃
C) NO₂
D) SO₂
E) SO₃

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Question 43

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The mass of nitrogen dioxide contained in a 4.32 L vessel at 48 °C and 141600 Pa is _ _g)

What is the partial pressure (in mm Hg) of neon in a 4.00 L vessel that contains 0.838 mol of methane, 0.184 mol of ethane, and 0.755 mol of neon at a total pressure of 928 mmHg?

Of the following, has the odor of rotting eggs.

A sample of an unknown volatile liquid was injected into a Dumas flask (m_flask = 27.0928 g, V_flask = 0.1040 L) and heated until no visible traces of the liquid could be found. The flask and its contents were then rapidly cooled and reweighed (m_flask+vapor = 27.4593 g) . The atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °C, respectively. The unknown volatile liquid was .

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0 °C and 4.31 atm is mL.

The pressure of a sample of CH₄ gas (6.022 g) in a 30.0 L vessel at 402 K is _ atm.

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5) 0 mol of Ne in the flask. The partial pressure of He is atm.

A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is atm.

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: What volume (L) of CO is formed from the complete decomposition of 444 g of Ni(CO) ₄ at 752 torr and 22.0 °C?

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, under the same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is _ g/mol.

A gas in a 325 mL container has a pressure of 695 torr at 19 °C. There are _ _ mol of gas in the flask.

The density of chlorine gas at 1.21 atm and 34.9 °C is g/L.

A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture?

A mixture of two gases was allowed to effuse from a container. One of the gases escaped from the container 1.43 times as fast as the other one. The two gases could have been _.

Of the following, is a valid statement of Charles' law.

Ammonium nitrite undergoes thermal decomposition to produce only gases: What volume (L) of gas is produced by the decomposition of 35.0 g of NH₄NO₂ (s) at 525 ° C and 1) 5 atm?

Of the following, _ is a correct statement of Boyle's law.

If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy L at STP.