Chemistry Calorimetry Solution: Zinc metal reacts with hydrochloric acid according...

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Solution: Zinc metal reacts with hydrochloric acid according to the following balanced equation. Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) When 0.116 g of Zn(s) is combined with enough HCl to make 52.3 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 21.5 °C to 24.7 °C. Find ΔHrxn in kJ/mol for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/g • °C as the specific heat capacity.)

Problem

Zinc metal reacts with hydrochloric acid according to the following balanced equation. 

Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) 

When 0.116 g of Zn(s) is combined with enough HCl to make 52.3 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 21.5 °C to 24.7 °C. 

Find ΔHrxn in kJ/mol for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/g • °C as the specific heat capacity.)



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