Question

Remember to use SI units!

QUESTION 1 What is the volume of a balloon A) with 5 mol of helium atoms at atmospheric pressure (101kPa) and room temperature (25°C)? B) If I add 3 mol more of helium atoms into the balloon, what is the ratio (new voly(old vol)? (round all answers to 3 sig fig) 10 points Save Answer QUESTION 2 What is the volume of a balloon A) with 5 mol of helium atoms at atmospheric pressure (101kPa) and room temperature (25°C)? B) If I add 3 mol more of helium atoms into the balloon, assuming that pressure and temperature remains the same, what is the ratio (new voly(old vol)? (round all answers to 3 sig fig)

Answer 1

= (1) number of moles n=5 pressure P = 101x10 Pa temperature T = (25+273.15) K = 298.15 K Universal gas constant R= 8.314 J mol K nRT (5)(8.314)(298.15) Volume of gas V = 0.123 m? P 101x10 (2) (5+3)(8.314) (298.15) New volume of gas V'= 0.1963 m 101x103 new volume 0.1963 = 1.60 old volume 0.1227 (3) If pressure is constant, (P = constant), Volume V T temperature new volume new temperature old volume old temperature 20 + 273.15 = 0.983 25 + 273.15 (4) nRT (100) (8.314)(25+273.15) Pressure P= = 99152.764 Pa= 99.1 KP V 2.5 = =