When 0.876 g of cacl2 (110.98 g/mol) is added to 95.0 g of water at 22.4 °c in a ‘coffeecup’ calorimeter, the temperature of the resulting solution increases to 29.7 °c. the specific heat capacity of the solution is 4.184 j/°c·g and the heat capacity of the styrofoam cup is negligible. a) is this reaction endothermic or exothermic? how do you know? b) calculate the molar heat of solution (∆hrxn) of cacl2 in water

A) Exothermic

B) 367.6 kJ/mol

Explanation:

A) The reaction is exothermic, we know this because the temperature of the resulting solution increased.

B) We use two formulas

So first we calculate the heat Q released into the water:

Now we divide that value by the moles of CaCl₂:

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po-215 i got it right on the quiz