how many moles?

Question

For the reaction, calculate how many moles of the product form when 2.73 mol of H2 completely reacts. Assume that there is more than enough of the other reactant. H2(g)+Cl2(g)→2HCl(g) please help?

Answer 1

First write a balance equation

H₂(g)+Cl₂(g)→2HCl(g)

 

Next, note the mole ratio of reactants to products, taking into account if any reactant is limiting

1 mole H2 produces 2 moles HCl (Cl2 is in excess so is not limiting)

 

Finally, using this mole ratio, calculate moles of product (HCl) that can be made from 2.73 moles of H₂

2.73 moles H₂ x 2 moles HCl/mole H₂ = answer