Given:
10 g Glucose reacts with Oxygen
How many grams of H2O are formed?
C6H12O6 + O2
CO2 + H2O
NOTE: INFORMATION WAS ONLY GIVEN FOR ONE REACTANT, SO NO LIMITING
REACTANT CAN BE FOUND.
Step 1: Balance the equation
Step 2: What is given? Write it down. Calculate the MOLES/ CONCENTRATION of what is
given 1st (if possible)
Step 3: Look at what they want you to calculate
Step 4: Now compare the balancing ratios of what is given (step 2) to what you want to get
(step 3).
Step 5: MOST IMPORTANT STEP: Start with the substance in step 2 (Starting point). Use this
amount of moles as the starting point. Divide the moles by the ratio of that SAME
substance. Multiply the result by the ratio of the substance that you WANT. This gives you
the moles of the substance you want.
NB!!! If information for more than 1 reactant was given, calculate the moles for both and
determine the limiting reactant. The LIMITING REACTANT IS NOW YOUR STARTING POINT
Step 6: Use the moles of the substance you want (Step 5) and convert it into what the
௠
question wants using n= or whatever formula is required
ெ
Remember that you can only multiply from ratios using moles.