Question

10.6. During a combustion reaction in a closed container of adjustable
volume, 8 cm of compound A (butane) reacts in excess oxygen
according to the following balanced equation
2C4H10+13O2 =8CO2 +10H2O)
If the initial volume of the oxygen in the container 60 cm was, calculate
the TOTAL volume of the gases that are present in the container at the
end of the reaction. All gases in the container are at the same
temperature and pressure.
​

Answer 1

Avogadro’s Law states that when the pressures and temperatures are the same for different gases, equal volumes will contain equal numbers of particles. Your equation shows that 2 moles of butane produces 8 moles of CO2, which is a 1:4 molar ratio. since we are assuming everything is at STP, burning 2 L of Butane would produce 8 L of CO2, because for gases the molar ratio is the same as the volume ratio if their pressures and temperatures are the same.