Explain what a compound is and how you can tell one by looking at a chemical formula?

Explanation:

Chemical Compounds are substances that are made up of 2 or more elements that have reacted to each other through a chemical bond to give a different substance to the initial elements.

The chemical formula is an expression used to indicate the molecular composition of a compound. In other words, it indicates by means of symbols the elements that make up the compounds and their proportion.

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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.