In a coffee-cup calorimeter, 50.0mL of 0.100M AgNO3 and 50.0mL of 0.100M HCl are

Question

In a coffee-cup calorimeter, 50.0mL of 0.100M AgNO3 and 50.0mL of 0.100M HCl are mixed to yield the following reaction:

Ag+(aq) + Cl-(aq) ---> AgCl(s)

The 2 solutions were initially at 22.60 degree C, and the final temperature is 23.40 degree C. Assuming that the combined solution has a mass of 100.0g and a specific heat capacity of 4.18 J/Cg, the heat loss (q) that accompanies this reaction is ___J.

The answer is -330J, but please show work ans explain why.

Explanation / Answer

Firstly, the eqn: Ag+ + Cl- ----> AgCl_____dHrxn = ?? kJ/mole dHrxn/mole = - [4.18 J/gC * 100g * (23.23 - 22.47)C] / (0.050 liters * 0.100 mole / liter = ?? J/mole dHrxn = - [?? J/mole] / 1000J/kJ = ?? kj/mole

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