Question

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QUESTION 4 1 points Save Answer A fixed sample of gas exerts a pressure of 640 Torr at 322 K. What will the pressure be (in atm) if the temperature is reduced to 162 K(assuming the volume is held constant)? p = __ atm QUESTION 5 Save Answer A fixed sample of gas occupies 18.6 L at 62.6 °C and 0.677 atm. If the gas expands to 37.5 L and the temperature drops to 23.5 °C, what will the new pressure be? p = __ atm

Answer 1

4) Since the container is closed, the volume remains constant. According to Guy-lussac law, pressure of the gasis directly proporti onal to absolute temperature at constant volume P oc T P = constant T For twogas ses P 640 torr Initi al pressure of the gas Initi al temperature of the gas, T = 322 K Final temperature of the gas, T = 162 K Final pres sure of the gas, ? According to Guy-lussac la R 162 K = 640 torr 322 K 1 atm = 322 torrx 640 torr = 0,424 atm

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5) Initi al pressure of the gas, R 0.677 atm Initi al temperature, T = 62.6°C 273 335.6 K Initi al volume of the gas, 18.6 L Final volume of the gas, V 37.5 L Final temperature, T = 23.5° C273 = 296.5 K According to the ideal gas equation, RT Final pressure of the gas, A = (0.677 atm) (18.6 L) (296.5 K) X. (37.5 L) (335.6 K) 0.297 atm