Midterm 2, Physics 6C, Fall 2014 David Schriver Name Problem 4 A 110 liter0.110
ID: 1786867 • Letter: M
Question
Midterm 2, Physics 6C, Fall 2014 David Schriver Name Problem 4 A 110 liter0.110 m3) iron canister is filled with pure oxygen (02) gas at room temperature (293 K) at a total pressure of 23,500 kPa ( 2.35 × 107 Pa). The oxyge ideal gas and oxygen gas has a molecular mass Mo2 32.0 g/mole. n can be treated as an IS pts) 5 a) How many moles of oxygen gas are contained in the canister? [5 pts] b) What is the mass of the oxygen gas contained in the canister? [5 pts] c) How long will it take for exactly halfof the oxygen to flow out of the canister at a constant outflow rate of 0.225 mhour, measured at atmospheric pressure ( 1.013 × 105 Pa) and roomtemperature (293 K). (5 pts]d) After half the oxygen has been released, what will the pressure be inside the canister? Assume the inside temperature stays constant during the release. 20°C from room temperature (293 K) to 41.4220 K. What is the change in volume of the canister after it is heated? The [5 pts] e) The iron canister is put in an oven and heated coefficient of volume expansion for iron is -35.0 × 10-6 IK.Explanation / Answer
a)
V = volume = 0.11 m3
T = 293 K
P = 2.35 x 107 Pa
n = number of moles
using the equation
PV = n RT
( 2.35 x 107) (0.11) = n (8.314) (293)
n = 1061.2
b)
mass = n M = 1061.2 x 32 = 33958.4 g