H2+Cl2=2HCl How many moles of HCl will be produced when 2.8 moles of H2 were reacting with Cl2?

5.6 moles of HCl will be produced, as the hydrogen is in a one:two mole ratio with the HCl. 2.8 mol of molecular hydrogen will react with 2.8 mol of molecular chlorine, producing 5.6 mol of hydrocholric acid.