Please show how you got your answer 1 (a) On a certain day the outdoor temperatu
ID: 2264387 • Letter: P
Question
Please show how you got your answer
1 (a) On a certain day the outdoor temperature at UCLA is reported as 85 F. What is the value of this temperature in C and in K?
(b) A rigid tank contains 0.5 mole of Oxygen at a pressure of 4.0 x 106 Pa.
(i) Determine the amount (in mole) of Oxygen that must be withdrawn from the tank in order to lower
the pressure to 3.0 x 10^6 Pa without changing the volume and the temperature of the system.
(ii) If the molar mass of oxygen is 3.2 x 10-2 kg/mol., what is the final mass (in kg) of oxygen that
remained in the tank?
2. An aluminum cup contains 250 g of water and a 40 g copper stirrer, all at 30
Explanation / Answer
1
(a) On a certain day the outdoor temperature at UCLA is reported as 85 F. What is the value of this temperature in C and in K?
C = (5/9) (F - 32) = 5/9 * (85 - 32) = 29.4 C
(b) A rigid tank contains 0.5 mole of Oxygen at a pressure of 4.0 x 106 Pa.
(i) Determine the amount (in mole) of Oxygen that must be withdrawn from the tank in order to lower the pressure to 3.0 x 10^6 Pa without changing the volume and the temperature of the system.
PV = n R T
==> P/n = RT/V = constant
==> P1/n1 = P2/n2
==> n2 = (P2/P1) n1 = (3e6/4e6) * 0.5 = 0.375 mol
==> n1 - n2 = 0.5 - 0.375 = 0.125 mole
(ii) If the molar mass of oxygen is 3.2 x 10-2 kg/mol., what is the final mass (in kg) of oxygen that
remained in the tank?
m = 0.125 * 3.2e-2 = 0.004 Kg
-----------------------------------------------------------------------------------------------------------------------------------------------
2. An aluminum cup contains 250 g of water and a 40 g copper stirrer, all at 30
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.