A high pressure gas canister bursts. When the debris is cleared, frost (due to very low temperature) is found to have formed on the metal. A scientist decides to use the ideal gas law to find out how much the temperature of the gas changed when the cylinder burst. Why is this approach incorrect? Is it because (1) they do NOT know the moles of gas OR (2) The expansion was adiabatic OR (3) The gas was being stored as a compressed liquid OR (4) The expansion was isothermal?