Skip to content

Course home

Sign up

Atoms and reactions

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137
Question 35

Ozone (O3\text{O}_3O3​) in the upper stratosphere decomposes according to the following equation:

2O3(g)→3O2(g)ΔrH=−240 kJ mol−1 2\text{O}_3(\text{g}) \rightarrow 3\text{O}_2(\text{g}) \quad \Delta_{\text{r}} H = -240\text{ kJ mol}^{-1} 2O3​(g)→3O2​(g)Δr​H=−240 kJ mol−1

At a high altitude, the molar gas volume is approximately 5.0 m3 mol-1.

What is the energy released, in kJ\text{kJ}kJ, during the decomposition of 2.0 m3 of ozone under these conditions?

A

96.096.096.0

B

192192192

C

300300300

D

48.048.048.0

Markscheme

Atoms and reactions Questions

  1. A Level
  2. /Chemistry
  3. /Atoms and reactions

199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank