Recent content by Vegie

Ahhh I see. I'm not too good with the equation editor, so I'll try and explain this as best as I can. Using your equation, I had an intergrand of 1/(V^gamma) dv. My value for gamma was 7/5. This integrated to -5/2 * 1/V^(2/5). Subbing in my values for V2 and V1, and multiplying by P1...

Method 1: ΔE = W W = PΔV → 101300*(1.8852x10-4 - 24.915x10-6) W = 16.57 J ∴ ΔE = 16.57 J Method 2: ΔE = 2.5 nR ΔT ΔE = 2.5 * 7.9x10-3 * 8.314 * (653.8 - 291) ΔE = 59.57 J

My initial volume was calculated to be 1.8852x10-4 m3. Using this volume to calculate the number of moles, I get 7.9x10-3 moles. That's what I've done, but I'm having trouble with the change in internal energy part. How do I calculate the change in internal energy?

Thanks for your reply. I was unsure about the volume, but I'm not too sure how else I could calculate it (Unless I used P1V1 = P2V2 to find V2 and then using P1V1 / T1 = P2V2 / T2 to find T2?) Since the whole topic that this question is on sort of focused around adiabatic expansion, I presumed...

Homework Statement Consider a pump that is required to compress air in a factory. The cylinder in the pump has an inner diameter of 2.00 cm and length 60.0 cm. Air is drawn into the pump at atmospheric pressure and 18°C and the pump adiabatically compresses the air to a pressure of 17...