100 mL of a 0.300 M solution of AgNO3 reacts with 100 mL of a 0.300 M solution of HCl in a coffee-cup calorimeter and the temperature rises from 21.80 °C to 23.20 °C. Assuming the density
and specific heat of the resulting solution is 1.00 g/mL and 4.18 J/g. °C, respectfully, what is the
AHºx?
A 39.0 kJ/mol
B +39.0 kJ/mol
C.+1.17 kJ/mol

Explanation:

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In this case, since it is possible to assume that the heat released by the reaction is absorbed by the water in the calorimeter we can write:

Now, since the reaction between silver nitrate and hydrochloric acid is:

We can see there is a reacting 1:1 mole ratio, thus, the reacting moles are computed via the molarity of the solutions:

Finally, the enthalpy of reaction is:

And in kJ:

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