A frictionless piston-cylinder device contains 3.48 g of pure argon, an ideal gas. Margaret and Dominic observe the piston expanding isobarically at 35.6 psia from 1205 mL to 1425 mL. Calculate the heat interaction and change in internal energy. U₂ - U₁ = Ex: 63.4 J Q12 Ex: 106 = J
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