You would take $425.82 and add her deposit of $120.75 to get $546.57. Next you would the the $546.57 and subtract her withdrawl of $185.90 which will give you $360.67.
The obvious answer is because propane is a gas at room temperature, while 2-propanol is a liquid at room temperature.
That happens because the intermolecular forces that exist between 2-propanol, or isopropyl alcohol, molecules are stronger than those that exist between propane molecules.
