List at least two chemical reactions that resulted in a white precipitate. for these reactions list the possible chemical name of the precipitate. what do these reactions (and the others with white precipitates) have in common?

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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.