If a reaction starts with 5 atoms of Hydrogen, how many will there be after they react with 10 atoms of Oxygen?

If 5 atoms of hydrogen react with 10 atoms of oxygen, the resulting compound will contain 5 atoms of hydrogen and 10 atoms of oxygen.

The balanced chemical equation for this reaction is:

5H2 + 10O2 -> 5H2O

On the reactant side of the equation, we have 5 atoms of hydrogen (H2) and 10 atoms of oxygen (O2). On the product side, we have 5 molecules of water (H2O), which contain 5 atoms of hydrogen and 10 atoms of oxygen.

Therefore, after the reaction between hydrogen and oxygen is complete, there will be a total of 5 atoms of hydrogen and 10 atoms of oxygen.