A mixture of nitrogen gas and hydrogen gas reacts in a closed container to form ammonia, NH3 (g). The reaction ceases before either reactant has been totally consumed. At this stage 1.2 mol nitrogen gas, 1.2 mol hydrogen gas, and 1.2 mol ammonia are present.
How many moles of N2, and H2 were present originally?

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products