Awelding torch produces a flame by burning acetylene fuel in the presence of oxygen the energy released from the acetylene fuel is then used to melt a metal which energy transformation happens during this process

A. Chemical energy turns into thermal energy.

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.