Which reactant will be left over if 5.00 g H2 is mixed with 10.00 g O2?

Question

If 5.00 g of hydrogen reacts completely 44.1 g of water is produced.

 

If 10.00 g of oxygen reacts completely 11.3 g of water is produced.

Answer 1

After 11.3 g of H₂O are produced, there will be no more O₂ but excess H₂.