Answer
$H_2$ and $O_2$ will not react at room temperature because there is a large activation energy that must be overcome every time the two molecules are to react and form water.
Work Step by Step
Concept explained in-depth in textbook.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.