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Unformatted text preview: as |Work| =p A h = p V where V = V final - V initial . If V is positive then the gas is expanding and doing work on the surroundings. So work should be negative Work = - p V This equation is true in general, not just for pistons. Calculate the work associated with the expansion of a gas from 46 L to 64 L at a constant external pressure of 15 atm. First we calculate V = 64 L - 46 L = 18 L Using P=15 atm, we can then calculate Work = - p V = (15 atm) (18 L) = -270 atm-L Using the conversion between atm-L and Joules of 1 L-atm = 101.325 J Thus, we obtain So, when the gas expands it does 27.4 kJ of work on its surroundings ( i.e. , 27.4 kJ of energy flows out of the system so the work is negative)....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.
- Fall '10