Fun With Molar Ratios By: Andrea Moody

What’s a Molar Ratio? A molar ratio is a ratio between the number of moles of any two species involved in a chemical reaction!

Whaaa? For example: 2H2 + O2  2H2O 2 mol 1 mol 2 mol

And Then… 2 mol H2O 2 mol H2 1 mol O2 --------------- -------------- ------------- 1 mol O2 2 mol H2O 2 mol H2 1 mol O2 2 mol H2O 2 mol H2O -------------- ---------------- --------------

For Example… Number of moles of H2O that can be obtained from 4.0 mol of O2. (2 mol H2O) (4.0 mol O2) -------------- = 8.0 mol H2O (1 mol O2)

What are the steps? 1) Convert the quantity of starting substance to moles (if it is not given in moles) 2) Convert the moles of starting substances to moles of desired substance. 3) Convert the moles of desired substance to the units specified in the problem.

And Finally… YOU’RE DONE!!!