For the reaction 2H2 + O2 -- 2H2O, how do I give an equation for the equilibrium constant in terms of the concentrations of products and reactants involved?

For any reaction, the equilibrium constant is given in the form: K = [products] / [reactants]

Where [ ] is used to denote the concentration of the species. 

Therefore we can substitute in for the molecules given above, which becomes, K = [H2O] / ([H2] x [O2]). 

But, we're not finished there. We have to remember the stoichiometric coefficients given in the balanced equation, and put them to the power of the respective molecules. 

This gives the final, correct answer, K = [H2O]2 / ([H2]2 x [O2]). 

LS
Answered by Liam S. Chemistry tutor

24018 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

What is a chiral carbon and optical isomerism?


I don't understand how the first two quantum numbers fit into describing atoms.


How will the position of equilibrium shift for an endothermic reaction when heated?


What are the strongest intermolecular forces in CH4, NH3 and H2O? From this deduce which has the highest boiling point, giving reasoning.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning