41. Aluminum displaces chromium from chromium (III) oxide. 2Al (s) + Cr2O3 (s) → Al2O3 (s) + 2Cr (s) ΔH = -536 kJ How much heat will be released in the reaction of 10.0g of aluminum with 25.0g of Cr2O3?
42. Write the thermochemical equation for the combustion of acetylene; C2H2 (g) in oxygen, for which the standard enthalpy of reaction is -1300 kJ per mole of acetylene. The reaction products are carbon dioxide and water. What is the heat of reaction for burning 65g of acetylene in oxygen (at 298K)?