# Stoichiometry

## What is Stoichiometry

It is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.

## Balancing a equation

To solve a Stoichiometry problem you have to look at the two elements given and find out what type of reaction it is. Then the next step would be to balance out the equation and write the states of matter. For example if Barium Hydroxide-Ba(OH)2 and Aluminum Nitrate-Al(NO3)3 are given, then this would be a double replacement reaction. This means that Barium and and Aluminum would change spots making Barium Nitrate-Ba(No3)2 and Aluminum Hydroxide-Al(OH)3. The final step would be to balance it out by adding coefficients.

## Figuring out molar mass

To find out the molar mass you will need a periodic table, and a calculator is optional. First find the mass of every element and multiply it by the subscript(which is the small # on the equations).Remember that if there are two subscripts-one on the inside of the equation and one on the outside- the first element gets the subscript on the outside, and the second element gets the two subscripts multiplied with each other. So in our example The molar mass of Ba(OH)2 is 171.342 g/mole, Al(NO3)3 is 212.994 g/mole, Ba(No3)2 is 309.333g/mole, and Al(OH)3 is 339.339g/mole.
Stoichiometry - Chemistry