For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products?
W(g) + X(g) ⇌ 2Y(g) + Z(g)
ΔH = +447 kJ mol⁻¹
A High pressure and high temperature
B High pressure and low temperature
C Low pressure and high temperature
D Low pressure and low temperature - AQA - A-Level Chemistry - Question 34 - 2018 - Paper 3
Question 34
For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products?
W(g) + X(g) ⇌ 2Y(g) + Z(g)
... show full transcript
Worked Solution & Example Answer:For this reaction at equilibrium, which combination of temperature and pressure would give the greatest equilibrium yield of products?
W(g) + X(g) ⇌ 2Y(g) + Z(g)
ΔH = +447 kJ mol⁻¹
A High pressure and high temperature
B High pressure and low temperature
C Low pressure and high temperature
D Low pressure and low temperature - AQA - A-Level Chemistry - Question 34 - 2018 - Paper 3
Step 1
High pressure and high temperature
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This combination would favor the production of products; however, the reaction is endothermic (ΔH = +447 kJ mol⁻¹), which means higher temperatures are actually beneficial for shifting the equilibrium to the right.
Step 2
High pressure and low temperature
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
High pressure will favor the side with fewer gas molecules. However, low temperatures are not ideal for an endothermic reaction.
Step 3
Low pressure and high temperature
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Low pressure is not favorable since it could lead to lower yields of products, and although high temperature favors the endothermic reaction, the pressure factor is crucial.
Step 4
Low pressure and low temperature
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This combination is the least favorable as both factors work against producing the products.
