If a pure aluminum pan that has a specific heat of 0.21cal / g and a Heat of Fusion of 94.5cal/g and is at room temperature 21 degrees * C . The melting point of aluminum is 660 degrees * C . How big is the pan if it takes 54,400.5cal to melt the entire pan?

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.

it is b that is the answer.