Question

408 J of energy is transferred to a system consisting of 2.0 moles of an ideal gas. If the volume of this gas stays at a constant 4.4 L, calculate the change in internal energy of the gas.

Answer 1

Answer: The change in internal energy of the gas is +408 J

Step-by-step explanation:

According to first law of thermodynamics:

`\Delta E=q+w`

`\Delta E` =Change in internal energy

q = heat absorbed or released

w = work done or by the system

w = work done on the system=
`-P\Delta V`

As volume is constant ,
`\Delta V` = 0 and w = 0.

q = +408J {Heat absorbed by the system is positive}

`\Delta E=+408J+(0J)=+408J`

Thus the change in internal energy of the gas is +408 J