NAME: __________________________________ DATE: _____________________ PERIOD: _____
Gay-Lussac’s Law states that the pressure of a gas varies directly with its absolute temperature if volume and the number of particles are held constant. (Directly proportional means that if A goes up, B goes up.) The equation for GayLussac’s Law is: P1 / T1 = P2 / T2 [remember: TK = TC + 273] Solve the following problems. Show all work. Correct answers will include both a numerical answer showing correct significant figures as well as the correct units. 1…A sample of nitrogen gas, N2, has a pressure of 450-mm Hg at a temperature of 47ºC. What will the pressure of the gas be at 117ºC?
2…A sample of oxygen gas, O2, has a pressure of 0.33-atm at 40ºC. To what temperature must the gas be heated in order for the pressure to rise to 6.9-atm?
3…Hydrogen, H2, was cooled from 150ºC to 50ºC. The new pressure is 875-kPa. What was the original pressure?
4…If a sample of Chlorine gas, Cl2, has a pressure of 255-torr at 300-K, what absolute temperature would it have at 600-torr?
5…A sample of neon, Ne, at 50ºC and a pressure of 2.5-atm is cooled to 25ºC. What is the new pressure?
6…A sample of helium, He, has a pressure of 850-Pa at -45ºC. What is the pressure at 45ºC?
BONUS: Argon gas, Ar, at 273-K is warmed to 373-K. If the change in pressure is 58.6-kPa, what was the initial pressure of the gas?
NAME: __________________________________ DATE: _____________________ PERIOD: _____
Mixed Problems: Boyle’s Law, Charles’ Law, & Gay-Lussac’s Law Solve the following problems. Show all work. Correct answers will include both a numerical answer showing correct significant figures as well as the correct units.
1…A sample of nitrogen gas, N2, has a temperature of 227 ºC and a volume of 770-mL; calculate volume of the gas if the temperature is reduced to -12 ºC?
2…A sample of oxygen gas, O2, has a pressure of 0.36-atm at 717ºC; if the pressure is increased to 1.12atm, what is the new temperature?
3…Hydrogen, H2, is expanded from 8.9-m3 to 54-m3 if the final pressure is 18700-kPa, what was the original pressure?
4…If a sample of chlorine gas, Cl2, has a pressure of 2.55-atm at 300-K, what absolute temperature would it have at 612-torr?
5…A sample of neon, Ne, at 150-K and a volume of 141-milliliters is warmed to -35ºC. What is the new volume in liters?
6…A sample of helium, He, has a pressure of 850-kPa. The pressure is changed to 850-mmHg. Calculate the final volume if the initial was 97-mL.
7…A gas at STP is heated to a temperature of 273 ºC; calculate the new pressure in torr.