NEW CHAPTER!!!!!!!!!!!!! We are starting with Stoichiometry. It is the part of chemistry where we deal with the quantitative relationship that exists between the reactants and products in a chemical reaction. Normally in balanced equations, the relationships between the reactants and products form ratios of whole numbers.
Eg. N2 + 3H2 → 2NH3
The ratio for this would be 1:3:2
1 molecule of nitrogen (N2) reacts with 3 molecules of hydrogen (H2) to produce 2 molecules of ammonia (NH3)
Here is a link to a stoichiometry exercise:http://schools.cbe.ab.ca/b858/dept/sci/teacher/yancey%5CReview.book%5Cmole-quantityproblems.htm
Here is a YouTube video: