Question

Which of the following are true (can be multiple)

A. Two moles of helium (He) has the same total thermal energy as two moles of oxygen (O) when they are both at 80° C, even though an oxygen atom is heavier than a helium atom.
B. The average kinetic energy of an atom of an ideal gas approaches zero at a temperature of 0° C.
C. The ideal gas law can be written as PV = Nk_bT,where N is the number of molecules of the gas in the volume V and k_b is the Boltzmann constant.
D. If the temperature of a gas is heated from 10° C to 40° C, the average velocity of the atoms in the gas goes up by a factor of 2.

Answer 1

A. Two moles of helium (He) has the same total thermal energy as two moles of oxygen (O) when they are both at 80° C, even though an oxygen atom is heavier than a helium atom.

C. The ideal gas law can be written as PV = Nk_bT,where N is the number of molecules of the gas in the volume V and k_b is the Boltzmann constant.

B is not true. Because, kinetic energy approaches zero at 0 K bit not at 0 C.

D is also not true. because, when final temperature is 4 times of initial temperature in Kelvin scale the average velocity would be doubled.