Author Question: A cold trap is set up to cause molecules to linger near the suction in a vacuum system. If the cold ... (Read 19 times)

newyorker26 · **on:** Jul 29, 2018

A cold trap is set up to cause molecules to linger near the suction in a vacuum system. If the cold trap has an effective volume of 0.200 L and is maintained at how many molecules are in it at 10.0 Pa of pressure?

(Avogadro's number is 6.022 1023 molecules/mol, and the universal gas constant is 8.314 J/mol K. Assume the behavior of an ideal gas.)
A) 1.11 1019 molecules
B) 1.10 1022 molecules
C) 7.71 1020 molecules
D) 7.71 1023 molecules

Question 2

A bag of potato chips contains 2.00 L of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0C.

What will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00C and atmospheric pressure is 70.0 kPa? Assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air. (1 atm = 1.01 105 Pa)
A) 4.13 L
B) 1.01 L
C) 1.38 L
D) 2.76 L