A mass of 50g of calcium carbonate is heated, releasing carbon dioxide and calcium oxide. Which of these recorded masses of products is possible, according to the Law of
Conservation of Mass?

Select one:
23g of carbon dioxide, 50g of calcium oxide
29g of calcium oxide, 21g of carbon dioxide

50g of calcium oxide, 50g of carbon dioxide
50g of calcium oxide, 1g of recorded carbon dioxide

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.