Question

A helium-filled balloon at 305 K and 1 atm, contains 0.15 g He, and has a volume of 1.25 L. It's placed in a freezer (250.0 K), and its volume decreases to 0.90 L. Find the ΔE for the gas (in joules). (Cp of He = 20.8 J/mol K)

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