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

23128 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, PF3 .


Phosphorus is burned in air at 500 ºC to produce gaseous phosphorus(V) oxide. 220 g of phosphorus was reacted with an excess of air. Calculate the volume, in m3, of gaseous phosphorus(V) oxide produced


How does free radical substitution work?


State why it is initially unexpected for alkenes to undergo electrophilic addition with bromine. Explain why this reaction does indeed occur.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences