What do you call a substance that influences the reaction but does not participate in the reaction?

A substance that influences the reaction but does not participate in the reaction is called a catalyst. In other words, it increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

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Answer : option c) heat is released during the process.explanation :

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.