How many grams of KCl are produced if 25g of KCIO3 decompose?
2KCIO3
2KCI
+
302

15 g

Explanation:

The reaction that takes place is:

First we convert 25 g of KCIO₃ to moles, using its molar mass:

Then we convert KCIO₃ moles to KCl moles, using the stoichiometric coefficients:

Finally we convert KCl moles to grams, using the molar mass of KCl:

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.