Question

The particles in which sample of LiCl(s) have the same average kinetic energy as the particles in a 2.0-mole sample of H2O(l) at 25°C?

(1) 1.0 mol at 75°C
(2) 2.0 mol at 50.°C
(3) 3.0 mol at 25°C
(4) 4.0 mol at 0°C

Answer 1

3; average kinetic energy is just a fancy way of saying temperature. The average kinetic energy of a gas has nothing to do with the molar amount.

Answer 2

Answer;

-3.0 mole at 25 °C

Explanation;

-Temperature is a measure of average kinetic energy. If the samples are at the same temperature, they have the same average kinetic energy.

-Kinetic energy is related to the temperature (temperature is a measure of kinetic energy). Therefore; the higher the temperature the more kinetic energy. Because water is at 25 Celsius then the LiCl would have to be at 25 Celsius to have the same kinetic energy.