How many moles of hydrogen are consumed when 40.0 L of hydrogen chloride gas are produced in the following equation?

H2(g) + Cl2(g) 2 HCl(g)

1 answer

1. You need to add an arrow to your equation. Equations without arrows to separate the products from the reactants are useless.

2. Here is an example problem I've posted of a stoichiometry problem (which this is). Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html