Question

Which of the following is a correct statement of Charles's law, Select one: The volume of a gas sample varies directly with the absolute temperature b. All gas samples of the same volume at STP contain the same number of atoms. The volume of a gas varies proportionally with the pressure. O d. The pressure of a gas sample varies inversely with the volume, All gas samples of the same volume at STP contain the same number of molecules.

Answer 1

a) is correct as volume of gas is directly proportional to the temperature, according to charle's law.

b) is incorrect because at STP and same volume, the number of molecules of gas are same according to avogadro's law, not the atoms as the gas may be polyatomic

c) is incorrect as the volume of gas is inversly proportional to the pressure, according to boyle's law.

d) is correct as the volume of gas is directly proportional to the pressure, according to boyle's law.

e) is correct because at STP and same volume, the number of molecules of gas are same, according to avogadro's law.

Answer 2

An open-end mercury manometer was connected to a flask containing a gas at unknown pressure. The mercury in the arm open to the atmospheric pressure was 76mm lower than the mercury in the arm connected to the flask. The atmospheric pressure 749 torr. What was the Pressure of the gas in the flask in Pascal?