For the theoretically perfect reaction 2H2 + O2 ----- 2H2O, if you react 300 molecules of hydrogen and 200 molecules of oxygen, how many oxygen molecules will you have that do not engage in the reaction?

Question

For the theoretically perfect reaction 2H2 + O2 -----> 2H2O, if you react 300 molecules of hydrogen and 200 molecules of oxygen, how many oxygen molecules will you have that do not engage in the reaction?

abmon98 · Answer

Since the ratio of H2 to O2 is 2:1, only 150 molecules of O2 will get in the chemical reaction while 50 molecules will remain as excess.