53. A piece of zinc reacts completely with hydrochloric acid, HCl(aq), to produce an aqueous solution of
zinc chloride, ZnCl2(aq), and hydrogen gas.
a. Use the data shown below to determine the
enthalpy of reaction per mole of zinc.
AH; of HCl(aq) = -167.2 kJ/mol
AH; of ZnCl2(aq) = -488.2 kJ/mol
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
b. What mass of zinc must be used for 123 kJ of heat
to be given off?
=-
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