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Exam 5: Gases

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Question 31

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Which of the following gases has the highest root mean square velocity at constant temperature?

A) NH₃
B) CO₂
C) NO₂
D) F₂
E) O₃

F) B) and E)
G) A) and E)

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Question 32

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What volume would 1.02 moles of Kr occupy at a pressure of 1.65 bar and a temperature of 281.2 K?

A) 28.7 L
B) 14.5 L
C) 12.7 L
D) 6.87 L
E) 16.9 L

F) B) and E)
G) A) and D)

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Question 33

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Which one of the following gas laws explains the increase in volume of a basketball upon inflating it at constant temperature and constant pressure?

Determine the volume of O₂ (at STP) formed when 50.0 g of KClO₃ decomposes according to the following reaction. The molar mass for KClO₃ is 122.55 g mol^-1. 2KClO₃(s) → 2KCl(s) + 3O₂(g)

A fixed amount of gas at 25.0 °C occupies a volume of 20.0 L when the pressure is 0.8386 bar. Use Charles's law to calculate the volume (L) the gas will occupy when the temperature is increased to while maintaining the pressure at 0.8386 bar.

Match the following. -Ideal gas law

A container filled with gas is connected to an open-end manometer that is filled with mineral oil. The pressure in the gas container is 753 mmHg and atmospheric pressure is 724 mmHg. How high will the level rise in the manometer if the densities of Hg and mineral oil are 13.6 g mL^-1 and 0.822 g mL^-1, respectively?

Which of the gases in the graph below has the largest molar mass?

According to Avogadro's law, the volume of a gas sample ________ with an increase in the number of moles of gas in the sample. Avogadro's law assumes constant temperature and constant pressure and is independent of the identity of the gas.

If a sample of 0.29 moles of Ar occupies 3.8 L under certain conditions, what volume will 0.66 moles occupy under the same conditions?

Which of the gases in the graph below has the smallest molar mass?

You have three cylinders containing O₂ gas at the same volume and pressure. Cylinder A is at -15 °C, cylinder B is at -5 °F, cylinder C is at 255 K. Which cylinder contains the largest mass of oxygen?

Match the following. -Dalton's law

Why does hot air rise?

To what volume will a sample of gas expand if it is heated from 50.0 °C and 2.33 L to 500.0 °C?

A syringe contains 589 mL of CO at 325 K and 1.2 bar. A second syringe contains 473 mL of N₂ at 298 K and 2.6 bar. What is the final pressure if the contents of these two syringes are injected into a 1.00 L container at 273 K?

Convert 717.28 mmHg to bar.

Define effusion.

Identify the gas particle that travels the fastest.

A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.43 bar. What is the identity of the halogen?