# Stoichiometry: Octane and Oxygen

## Stoichiometry

Stoichiometry means the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers and translates to "measurement of elements".

## Octane and Oxygen in Real Life

An example of a real world use of the reaction of octane and oxygen would be the burning of gasoline. Gasoline is mostly made of octane, so a reaction of octane and oxygen would burn it, producing carbon dioxide and water.

## balanced, named, and measured

2C8H18(L) + 25O2(g) = 16CO2(g) + 18H2O(L)

Octane- C8H18 114.23g/mol

Oxygen- O2 32g/mol

Carbon Dioxide- CO2 44.01g/mol

Water- H2O 18g/mol

## mole to mole conversions

octane and water

114.23g/mol = 6.35mol

18g/mol

## Mass to mass conversions

12.1g x 18g/mol = 1.91g

114.23g/mol

## limiting and excess reactant

Octane 12.1g

Oxygen 20.15g

Octane is the limiting reactant and Oxygen is the excess reactant.

## percent yield

6.5g x 100 = 36.1%

18g