Question

How do stoichiometric ratios relate reactants to products?

Answer 1

I know that you have cooked delicious food or have seen somebody making fast French toast.

http://allrecipes.com/Recipe/Eggnog-French-Toast-2/?prop24=hn_slide1_Eggnog-French-Toast&evt19=1

as per the recipe 2eggs are required to get 12 delicious French toast.
I can use this as to calculate (a) How many French Toast will one get if one has 4 eggs? (b) How many eggs are needed to get specific number (let us say 36 ) French toasts?

2 eggs will give me 12 delicious French Toast.

I can use this as ratio 12 delicious French Toast / 2 eggs.

1 egg will help me to make 6 Delicious French Toast.

4 eggs will help me to get 6 x 4 Delicious French Toast , 24 French Toast.

To have 12 delicious French Toast we need 2 eggs

To get 1 delicious French Toast we need 2/12 eggs

To get 36 delicious French Toast we need 36 x (2 /12 ) eggs or 6 eggs.

Chemical equations are like chemical recipe equations It shows how many moles are required to get certain desired moles of product, or how many moles of product one get from specific moles of reactants.

Let us look at the following equation.

2`H_2` + `O_2` -----------> 2 `H_2`O

2 moles of `H_2` is required to get 2 moles of `H_2`O

1 mole of `O_2` is required to get 2 moles of `H_2`O