Limiting Reactant WS Name:
Date: Per:
Reaction I
1. Write the balanced equation for the reaction between hydrogen and oxygen.
Balanced Equation: ____ H2(g) + ____ O2(g) → ____ H2O(g)
2. Suppose that 4 molecules of hydrogen gas and 4 molecules of oxygen gas react to form water. Make a
drawing that represents the reaction container before and after the reaction.
Before After
3. How many molecules of water can be produced?
4. Which reactant is in excess? Why?
5. How many molecules of excess reactant are there?
6. What determines how much product can be made from a particular reactant mix?
Reaction II
1. Write the equation for the formation of ammonia from nitrogen gas and hydrogen gas.
Balanced Equation: ___________________________________________________________
2. Given 6 molecules of nitrogen and 12 molecules of hydrogen, make a drawing that represents the reaction
container before and after the reaction.
Before After
3. How many molecules of ammonia can be produced?
4. Which reactant is in excess? Why?
5. How many molecules of excess reactant are there?
6. Describe what you must look for in a particular reactant mixture to decide which reactant will be in
excess (have some left over after the reaction):
