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Your solutions to (10) and (11) should include PV diagrams. (10) [6 points] To discover whether an unknown gas is monatomic or diatomic, an experimenter takes a \( 2.0 \mathrm{~L} \) sample of the gas at STP and heats this sample to \( 100^{\circ} \mathrm{C} \) at constant volume. (a) The gas absorbs \( 180 \mathrm{~J} \) of heat-energy in this process. Is this gas monatomic or diatomic? (b) The experimenter weighs the sample and finds it has a mass of \( 2.5 \mathrm{~g} \). What molecule or atom comprises the gas? (c) The experimenter then releases a piston and allows the gas to cool to room temperature \( 20^{\circ} \mathrm{C} \) under constant pressure. How much work does the gas do (take care of the sign)?

          Your solutions to (10) and (11) should include PV diagrams.
(10) [6 points] To discover whether an unknown gas is monatomic or diatomic, an experimenter takes a \( 2.0 \mathrm{~L} \) sample of the gas at STP and heats this sample to \( 100^{\circ} \mathrm{C} \) at constant volume. (a) The gas absorbs \( 180 \mathrm{~J} \) of heat-energy in this process. Is this gas monatomic or diatomic? (b) The experimenter weighs the sample and finds it has a mass of \( 2.5 \mathrm{~g} \). What molecule or atom comprises the gas? (c) The experimenter then releases a piston and allows the gas to cool to room temperature \( 20^{\circ} \mathrm{C} \) under constant pressure. How much work does the gas do (take care of the sign)?

Your solutions to (10) and (11) should include PV diagrams.
(10) [6 points] To discover whether an unknown gas is monatomic or diatomic, an experimenter takes a 2.0 L sample of the gas at STP and heats this sample to 100^∘C at constant volume. (a) The gas absorbs 180 J of heat-energy in this process. Is this gas monatomic or diatomic? (b) The experimenter weighs the sample and finds it has a mass of 2.5 g. What molecule or atom comprises the gas? (c) The experimenter then releases a piston and allows the gas to cool to room temperature 20^∘C under constant pressure. How much work does the gas do (take care of the sign)?

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