when a sample of a gas is heated at constant pressure, the average kinetic energy of its molecules?

Question

i know it's increase, but does its volume increase or decrease? and an explanation why please.

what is the minimum number of calories needed to chance 40 grams of water at 100 C to steam at the same temperature and pressure? 1. 43200, 2. 21600, 3l540, 4.40.


A gas sample is at 10 C, if pressure remains constant, the volume will increase when the temperature is changed to. 1. 263 K, 2. 273 K, 3. 283 K, 4.293 K

Answer 1

The relevant equation, combining Boyle's and Charles's laws is P1V1/T1 = P2V2/T2. So if you hold the pressure constant while increasing the temperature, the volume has to go up.

I seem to remember that the latent heat of vaporization of water is 512cal/g. So (512)(40) = 20480, so 21,600 seems about right.

10C = 283K, so you'd have to heat to 293K to get the volume to go up.

Answer 2

C heating ability increasing the thermal power of the substance, increasing its temperature. Temperature is likewise with reference to the traditional KE of the molecules of the substance. also, the temperature is promptly proportional to the quantity of the substance.

Answer 3

the "average" kinetic energy in a gas is mostly 0