Write a balanced equation for the reaction

A gaseous mixture containing 7.50 mol H2(g) and 9.00 mol Cl2(g) reacts to form hydrogen chloride (HCl) gas. a) Write a balanced equation for the reaction. b) Which reactant is limiting? c) If all the limiting reactant is consumed how many moles of hydrogen chloride are formed? d) How many moles of the excess reactant remain unreacted?