Question
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apter 8 Pre-Lecture Assignment (-RATI PV Work V Work The joule (J) is a unit of energy. Recall that energy may be converted between many different forms such as mechanical energy, thermal energy (heat), chemical energy, electrical energy, and light. The mechanical energy produced by a system is called work. When work is accomplished through the changing volume of a gas, it is called PV work and is given by the formula w PAV where w is the work, Pis the external pressure, and AVis the change in volume. If the volume change and pressure are in liters and atmospheres respecitvely, then the work will have units of liter- atmospheres, which can be converted to joules J. using the conversion factor 1 L atm 101.3 Work can also be expressed as force multiplied by distance: w F x d, where w is the work F is the force in newtons, and d is the distance in meters. Note that 1 N.m 1 J Resources previous 1 of 4 next Part A A piston has an extemal pressure of 6.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.160 liters to 0.550 liters? Express your answer with the appropriate units. w Value Units Hints My Answers Give Up Review Part Submit Continue Provide Feedback
Explanation / Answer
W= -P * delta V
Convert 6 atm to Pascals.
W = -6 atm* (.39 liters)
W= -2.34 L atm
Multiply the LATM value by 101.325, the number of joules equivalent to 1 liter atmosphere. In the example, you would multiply -2.34 LATM by 101.325 to get Joules.
