Intermolecular Forces and Properties Q2

A 2.00 L sample of pure oxygen gas (O₂) is measured at STP.  How many moles of oxygen is this?

• 24.4 mol
• 0.007 mol
• 1.44 mol
• 0.09 mol

A 7.00 L sample of argon gas at 420. K exerts a pressure of 625 kPa.  If the gas is compressed to 1.25 L and the temperature is lowered to 350 K, what will be its new pressure in atm?

• 10.4 atm
• 2920 atm
• 2916.7 atm
• 28.8 atm

How many grams of N₂O₅ gas  are in a sample that has a volume of 2.00 Liters at 298 K and 100. kPa of pressure.  

• 8.72 grams
• 0.0807 grams
• 12.3 grams
• 883 grams

Calculate the volume that a 0.323-mol sample of a gas will occupy at -8^oC and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

Under which of the following conditions do REAL gases behave most like IDEAL gases?

• High pressure and high temperature
• High pressure and low temperature
• Low pressure and low temperature
• Low pressure and high temperature

What is true of molecules of gas that are exposed to heat in a fixed volume container?

• They move faster and they cause the pressure to increase

• They move slower and pressure will decrease

• The volume increases and pressure increases

• The volume decreases and the pressure decreases.

What is diffusion?

• The movement of gas particles from a higher concentration to a lower concentration.

• The rate at which gas flows through the air.

• An explosion of gases.

• The ability of a gas to move from high pressure to a low pressure.

A 7.00 L sample of argon gas at 420 K exerts a pressure of 625 kPa. If the gas is compressed to 1.25 L and the temperature is lowered to 350 K, what will be its new pressure in kPa?

• 0.000238 kPa

• 2916 kPa

• 4200 kPa

• 93.0 kPa

Which of the following explains the change in pressure when volume increases?

• As the volume increases, the particles slow down, causing less collisions and less pressure.

• As the volume increases, the particles speed up, causing more collisions and more pressure.

• As the volume increases, the particles have more space to move and collide less with the walls , causing pressure to decrease.

• As the volume increases, the particles have more space to move and collide less with the walls , causing pressure to increase.

What is movement of one material through another (higher concentration to lower concentration)?

• diffusion

• temperature

• barometer

• pressure