Agas in a piston-cylinder device is compressed, and as a result its temperature rises. is this a heat or work interaction?

Explanation:

When the gas is compressed under piston cylinder device it means that it is a closed system.And we know that in closed system only heat and work transfer can take place only ,there will be no any mass transfer between the system and surrounding.

During compression temperature of gas increases so the this may be cause on work done on the gas or maybe cause of heat supply to the gas.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.