Question

Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. After complete reaction, how many molecules of ammonia are produced? How many molecules of H2 remain? How many molecules of N2 remain? What is the limiting reactant? Assume 4 molecules of nitrogen and 9 molecules of hydrogen are present.

Answer 1

Nitrogen combines with hydrogen to form ammonia according to the following equation:

N₂ + 3H₂ ------> 2NH₃  

_{i) This means One molecule of N2 reacts with 3 molecules of H2 to form 3 molecules of ammonia.}

_{Total 4 N2 and 9 H2 molecules will produce 6 molecules of ammonia as per following equation:}

_{3N2 + 9H2 ---------->   6NH3     molecules}  

_{2)     One nitrogen molecule remains in excess.}

_{3) Actually for combining 4 molecules of nitrogen 12 hyrogen molecules are required . i.e. 3 molecules of hydrogen are less hence hydrogen is a limiting reactant.}

_{4) No. hydrogen molecules remain in the reaction.}