At 154.4°C a 72.2 g sample of copper is added to an insulated vessel containing 165.0 mL of an unknown hydrocarbon at 22.7 °C whose molar mass is 134.1 g/mol and density is1.26 g/mL. The final temperature is 33.3 °C. The specific heat of copper is 0.393 J/g° C. Calculate the molar heat capacity of the unknown hydrocarbon in J/mol°C?