🤓 Based on our data, we think this question is relevant for Professor Berns' class at NU.
Recall: The change in internal energy (ΔE or ΔU) is given by:
The formula for work at constant pressure is:
where ΔV = change in volume (final V – initial V).
The formula for heat at constant pressure is:
where n = moles of compound, Cp = molar heat capacity at constant pressure, and ΔT = change in temperature (final T – initial T).
Consider a balloon filled with helium at the following conditions.
313 g He
Molar Heat Capacity = 20.8 J/°C • mol
The temperature of this balloon is decreased by 41.6°C as the volume decreases to 1643 L, with the pressure remaining constant. Determine q, w, and ΔE (in kJ) for the compression of the balloon.