10. Question 10
16.6 g of zinc metal completely reacts with an aqueous solution of copper(II) chloride according to the following reaction:

Zn(s) + 2Cl1-(aq) + Cu2+(aq) → Zn2+(aq) + 2Cl1-(aq) + Cu(s)

If the total final volume of solution is 175 mL, then what is the molar concentration of Zn2+(aq) that forms if the reaction proceeds to 100% completion with no side reactions? The answer is M.

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.

c. 4.54 x 10–12 j happens to be correct