Question

how many moles of H2O are producted in a reaction by 2.72mol H2 in a access of O2

Answer 1

Write down and balance the equation first.

2 moles of reacts with oxygen to produce 2 moles of h2o therefore meaning that 2.72 moles of h2 will produce 2.72 moles of h2o$2H_2 + O_2\to 2H_2O$