3 SEPTEMBER 2020
Question 1
SEMESTER TEST 1
PART 3
Chemical Equilibrium
[12]
Some SO2 and O2 are mixed together in a flask at 1100 K in such a way ,that at the instant
of mixing, their partial pressures are, respectively, 1.00 atm and 0.500 atm. When the
system comes to equilibrium at 1100 K, the total pressure in the flask is found to be 1.35
atm.
Given: 2SO2 (g) + O2 (g) ⇌ 2SO3 (g); Δr H = − 198.2 kJ. mol−1 .
1.1
Calculate Kp at 1100 K.
1.2
Complete the following sentence: You may only use the following words/phrases to do
so : “increased”; “decreased”, or “kept constant”.
The yield of SO3 will be a maximum if the temperature is ______ and the pressure is _____.
[10]
[2]