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An ideal gas in a cylinder fitted with a piston expands when heat is added to the cylinder. The initial volume of the gas is 2.90 L and its final volume is 3.50 L. If the gas expands against a constant pressure of 4.20 atm, find the following. (a) What is the amount of work (w) performed in this process? (b) Is work performed by the system or by the surroundings? (c) Will the heat transfer value (q) be positive or negative for this reaction?