Question

Question 5 2.5 pts In lab, a student weighed out 3.578 g of an unknown salt. Her coffee cup calorimeter weighed 38.248 g. After adding water it weighed 85.784 g. Before the addition of salt, the temperature of the water in the coffee cup was 21° C. After all the salt dissolved the maximum temperature was 18.3 °C. Calculate the enthalpy of solution for the salt, AHln. Report your answer in J. You can practice the math using this virtual lab. Note: Use the "Solids" tab to select a practice salt.

Answer 1

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tíost we find man of.thao = 85.784 – 13.578.+ 38.24%) = 43.958 gm from q=mcat where as specific hear of H₂O = 4.1845/°c AT = Tfino - Tinitiai - 19.3 - 21 = -2.7°C Akin = q = 43.958 gm * (-2.7°C) * 4.1845,66 Dresin fq = – 496.585 ve sign represent energy is released during dissolution