A 100.0 mL sample of 0.300 M Ca(OH)2 is mixed with 100.0 mL of 0.700 M H3PO4 in a coffee cup calorimeter. If both solutions were initially at 35.0 degrees celsius and the resulting solution had a temperature that was recorded at 39.7 degrees celsius, determine the delta Hrxn in units of kj/mol. Assume the solution has the same specific heat and density as water.
No table is given for standard enthalpy of the solutions so where do I even start then?
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