Answer to Question #98618 in General Chemistry for Emmanuella

Question

2MnO2 + 2KOH + O2 = 2 KMnO4 + H2
Why is there excess oxygen gas

Answer 1

$2MnO_2 + 2KOH + O_2 = 2 KMnO_4 + H_2$

We know KMnO₄ is a strong oxidizing agent.So it will oxidise H₂ andreduce itself to form MnO₂ and KOH.

The backward reaction is more favourable,so,oxygen is produced.Thus,there is excess oxygen gas.