Question: An expandable cube, initially (20 mathrm{~cm}) on each side, contains (3.0 mathrm{~g}) of helium at (20^{circ} mathrm{C} .1000 mathrm{~J}) of heat energy are transferred to

An expandable cube, initially $20 \mathrm{~cm}$ on each side, contains $3.0 \mathrm{~g}$ of helium at $20^{\circ} \mathrm{C} .1000 \mathrm{~J}$ of heat energy are transferred to this gas. What are

(a) the final pressure if the process is at constant volume and

(b) the final volume if the process is at constant pressure?

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