Question

A reaction involves the following elementary steps:

H2(g)+O2(g) → H2O2(g)

H2(g)+H2O2(g) → 2H2O(g)

What is the sum of the two reactions, retaining all chemical species? Remember to include states of matter.

What is the net reaction when reactive intermediates are cancelled? Please include states of matter.

Answer 1

Sum of two reactions can be obtained by simply adding the reactants of one reaction to the reactants of other reaction and adding the products of one reaction to the products of other reaction.

Here, Two given reactions are

H₂(g) +O₂(g)-------> H₂O₂(g)

  H₂(g) +H₂O₂(g)--------> 2 H₂O(g)

Sum of two reactions ,retaining all chemical species

H₂(g) +O₂(g) +H₂(g) +H₂O₂(g)-------->H₂O₂(g) + 2H₂O(g)

OR

2H₂(g) +O₂(g) +H₂O₂(g)--------->H₂O₂(g) + 2H₂O(g)

Net reaction after cancellation of reactive intermediate

Since ,H₂O₂(g) is on both sides ,so it gets cancelled .

Now,

2H₂(g) + O₂(g)--------->2H₂O(g)