According to the kinetic molecular theory, which statement describes an ideal ga

Question

According to the kinetic molecular theory, which statement describes an ideal gas? The gas particles are diatomic. Energy is created when the gas particles collide. There are no attractive forces between the gas particles. The distance between the gas particles is small, compared to their size. A real gas differs from an ideal gas because the molecules of real gas have some volume and no attraction for each other some volume and some attraction for each other no volume and no attraction for each other no volume and some attraction for each other Each stoppered flask below contains 2 liters of a gas at STP. density mass number of molecules number of atoms A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample? 51.1 kPa 216 kPa 243 kPa 274 kPa

Explanation / Answer

28.

C. There are no attractive forces between the gas particles.

This is the major difference between ideal gas and real gas.

29.

B. Some volume and some attraction for each other.

The volume occupied by the ideal gas is assumed to be negligible in comparision with space available between the molecules and the forces operating between the gas molecules are assumed to be zero.

30.

C. The number of molecules.

This is based on Avogadro's law which states that,"equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".

31.

P1 = 105 kPa

V1 = 220 mL

T1 = 275 K

P2 =?

V2= 95 mL

T2 = 310 K

Using the equation

P1V1/T1 = P2V2/T2

P2 = P1V1T2/T1V2

P2 = (105 kPa x 220 mL x 310 K )/ (275 K x 95 mL) = 274 kPa

The answer is D

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