Gas Stoichiometry Problem (grade 11)?

23. When propane, C3H8 is burned in a restricted supply of oxygen, one of the products is CO. Since CO is a deadly poison even in small quantities, it is important that devices such as propane heaters operate in a plentiful supply of oxygen. If 4.25 L of propane gas measured at 25deg C and 125 kPa is burned in limited oxygen , what volume of CO gas at the same Temperature and pressure will be produced? i know the formula it is PV=nRT thx