A gaseous fuel mixture contains 24.2% methane (CH4), 40.5% ethane (C₂H6) and the rest propane (C3H8) by volume. When the fuel mixture contained in a 1.56 L tank, stored at 754 mmHg and 298 K, undergoes complete combustion, how much heat is emitted? (Assume that the water produced by the combustion is in the gaseous state.) Express your answer with the appropriate units.

Measurements show that the energy of a mixture of gaseous reactants decreases by 178. kJ during certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -163. kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture during the reaction. Round your answer to 2 significant digits. Is the reaction exothermic or endothermic? kJ exothermic endothermic x10 X

Explain the difference between heat capacity and specific heat of a substance. Heat capacity refers to the heat required to raise the temperature of a substance by 1 °C; specific heat refers to the heat required to raise the temperature of 1 gram of a substance by 1 °C. Thus, heat capacity is an intensive property, and specific heat is an extensive one. Specific heat refers to the heat required to raise the temperature of a substance by 1 °C; heat capacity refers to the heat required to raise the temperature of 1 gram of a substance by 1 °C. Thus, heat capacity is an intensive property, and specific heat is an extensive one. Heat capacity refers to the heat required to raise the temperature of a substance by 1 °C; specific heat refers to the heat required to raise the temperature of 1 gram of a substance by 1 °C. Thus, heat capacity is an extensive property, and specific heat is an intensive one.

An electrical heater is used to add 19.75 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 4.76°C. When 2.00 g of methanol (CH3OH) is burned in the same calorimeter, the temperature increases by 10.92°C. Calculate the molar heat of combustion for methanol (in kJ).