Interpret the following balanced chemical equations in terms of particles, moles, and mass. 1. Mg + 2HCl -> MgCl2 + H2
2. 2Al + 3CuSO4 -> Al2(SO4)3 + 3Cu
3. Cu(NO3)2 + 2KNO3

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

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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.