Question

The number of moles of hydrogen that is needed to produce 0.253 mol of water is

Answer 1

Start by writing out the balanced chemical equation .

ensure that the number of atoms is the same on both the reactants and products.

2H2 + O2 ---> 2H2O

Answer 2

How many moles of hydrogen

Look at the molar ratio

hydrogen to water is 2:2 which is a 1 to 1 molar ratio.

This means that for every mole of H2 reacted you have 1 mole of water produced.

Answer 3

0.253 mol of H2O x (H2/H2O)

Multiply by the molar ratio of H2/H20 ensuring that water is I the denominator.

And you get 0.253 mol of H2 gas