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April 20, 2014

Homework Help: Chemistry

Posted by dina on Friday, April 2, 2010 at 11:35pm.

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

Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)

When 0.114 g of Zn(s) is combined with enough HCl to make 51.1 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.5 degrees Celsius to 24.7 degrees Celsius .

Find Delta Hrxn 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.)

Delta Hrxn =.........KJ

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