Areaction that absorbs 49.6 kj from the surroundings in a vessel that undergoes a volume decrease of 1.25 l at a constant 4.00 atm pressure has an energy change, δe = kj.

Answer : The energy change is, 49.09 kJ

Explanation :

First law of thermodynamic : It states that the energy can not be created or destroyed, it can only change or transfer from one state to another state.

As per first law of thermodynamic,

or,

where,

= energy change

q = heat absorb = 49.6 kJ = 49600 J     (1 kJ = 1000 J)

P = pressure = 4.00 atm

= change in volume = 1.25 L

Now put all the given values in the above formula, we get:

As we know that, (1 L.atm = 101.325 J)

Therefore, the energy change is, 49.09 kJ

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

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.