For which one of the following substances is the standard enthalpy of formation, AHf, equal to zero? water [H20(1)]; O lead [Pb(s)]; carbon dioxide [CO2(s)]; carbon dioxide [CO>(g)]; tin [Sn(g)];

Canada is the world's eighth largest producer of iron ore. The smelting of iron ore involves many steps, chemicals and reactions. One such chemical reaction equation used in the smelting of iron ore is: Fe₂O3(s) + 3CO(g) → 3CO₂(g) + 2Fe(s) The standard enthalpy of reaction for the equation above is ( kJ.

A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy available from foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. In the laboratory a student burns a 0.983-g sample of glutaric acid (C;HgO4) in a bomb calorimeter containing 1170. g water. The temperature increases from 24.10 °C to 26.90 °C. The specific heat capacity of water is 4.184 J g-1 °C-!. The combustion enthalpy is -2151 kJ/mol glutaric acid. C5H3O4(s) + 5 02(g) 5 CO2(g) + 4 H2O(1) A,H° = -2151 kJ/mol Calculate the heat capacity of the calorimeter. heat capacity of calorimeter = J/°C

A scientist measures the standard enthalpy change for the following reaction to be -208.6 kJ :CO(g) + 3 H2(g)CH4(g) + H2O(g)Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CH4(g) is kJ/mol.