Checkpoint 5 Review PAP Chemistry

Which of the following represents the sample of N₂ that has the greatest mass?

• 0.75 mol of N₂ molecules

• 9.03 x 10²³ N₂ molecules

• 2.41 x 10²⁴ N atoms

• 14 g of N₂

Tags

NGSS.HS-PS1-7

The particle diagram shown represents a sample of gas at 1 atm pressure and a temperature of 300 K. Which of the following particle diagrams represents a sample of the gas at 2 atm and 600 K? (Assume that a box with half the area represents a container with half the volume.)

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Tags

NGSS.HS-PS1-5

Based on the information shown, which of the following explains why the pressure in tank X is greater than that in tank Y?

• There are moles of Ar than moles of N₂

• Argon is a noble gas and exerts more pressure.

• The molar mass of argon is greater than that of nitrogen.

• The volume of tank X is greater than that of tank Y.

N₂ is diatomic, but Ar is:

• Monatomic

• Triatomic

• Polyatomic

• Tetratomic

The molar mass of Ar is:

• Greater than that of N₂

• Less than that of N₂

• Equal to that of N₂

• Double that of N₂

Which of the following gases is the one in the container if there is a mass of 16 g? (hint: use ideal gas law to find the number of moles then the formula for molar mass to figure out the gas Molar mass = grams / moles)

• SO₂

• O₂

• CH₄

• He

Data for samples of N₂(g) at constant temperature are shown in a table. Which of the following graphs shows the relationship between the number of moles in the sample, n, and PV?

(see picture for data table)

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A 3.0 mol sample of CO₂ is in a rigid 6 L container at 400 ^oC.

Based on the information, what is the total pressure in the container?

• 16.4 atm

• 27.6 atm

• 200 atm

• 995 atm

A 3.0 mol sample of CO₂ is in a rigid 6 L container at 400 ^oC. The mass of the sample of CO₂ is closest to which of the following?

• 0.068 grams

• 44 grams

• 132 grams

• 264 grams

The figure shows a model of a gas with a volume of 2.5 L, a pressure of 4.6 atm, and a temperature of 280 K. The model shown is inaccurate. Which of the following changes would improve the accuracy of the model so that it represents the ideal gas law?

• Change the number of particles to 3.

• Change the number of particles to 10.

• Change the model such that one particle represents 0.1 mol of gas.

• Change the model such that one particle represents 10 mol of gas.