you want to create 12g of copper to meld into a piece of jewelry. you know that when copper (11) chloride reacts with aluminum, copper is a product. how much aluminum would you need to start your reaction with to get 12g of copper? (write and balance the equation first)

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.