To find the total change in internal energy of the gas, calculate the work done by the gas using the equation w = -Pext * ΔV and add it to the heat transferred to the gas. Given the values, we can find the total change in internal energy.
In this question, we are given information about the change in volume, external pressure, and heat transfer for a sample of an ideal gas undergoing an expansion.
We are asked to determine the total change in internal energy (AU) of the gas.
To find this, we can use the equation AU = q + w, where q is the heat transferred to the gas and w is the work done by the gas.
Since the process is at constant external pressure, the work done by the gas is given by w = -Pext * ΔV, where Pext is the external pressure and ΔV is the change in volume.
Plugging in the given values, we can calculate the total change in internal energy.