Question #90724

1 Answer
May 13, 2017

Answer:

You figure out the amount of #"O"_2# to react with 1 mol of #"H"# atoms.

Explanation:

We can define an equivalent as the amount of a substance that can combine with or displace one mole of hydrogen atoms.

However, the number of equivalents depends on the reaction involved.

Consider this reaction.

#"2H"_2 + "O"_2 → 2"H"_2"O"#

It takes 4 mol of #"H"# atoms to react with 1 mol of #"O"_2#.

So, 1 mol of #"H"# atoms reacts with 0.25 mol of #"O"_2#.

∴ 1 eq of #"O"_2# = 0.25 mol of #"O"_2#.

Now, consider this reaction.

#"H"_2 + "O"_2 → "H"_2"O"_2#

It takes 2 mol of #"H"# atoms to react with 1 mol of #"O"_2#.

So, 1 mol of #"H"# atoms reacts with 0.5 mol of #"O"_2#.

In this reaction, 1 eq of #"O"_2# = 0.5 mol of #"O"_2#.