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Question 13 7 pts Instant cold packs contain a solid in a pouch surrounded by water. When the pack is squeezed, the pouch breaks, and the solid dissolves, decreasing the temperature of the solution. The following reaction is used to make a cold pack. NH4NO3 (8) NH4NO3(aq) AH = +26.0 kJ What is the final temperature of the solution in °C when 19.3 grams of NH4NO3 is added to 83.2 grams of water at 35.0°C? The specific heat of the solution is 4.18 J/g °C and the molar mass of NH4NO3 is 80.0 g/mol. Enter your answer as a number to one decimal place without units.
Question 15 7 pts When 1.85 g of substance with a molecular weight of 86 g/mol is burned in a bomb calorimeter, the temperature rises from 25.00 to 37.14 °C. If the heat capacity of the calorimeter is 5.74 kJ/ °C, calculate the combustion energy (AE) in units of kJ/mol of the substance. Be sure the include the correct sign of AE and enter the value in units of kJ/mol of hydrocarbon. Enter your answer as a number without units.