A student dissolves 11.5 g of ammonium chloride (NH4C1) in 200. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 22.0 °C to 18.4 °C over the course of 4.2 minutes. L ALI Nata for ad nd - NH4Cl(s) NH,(aq) + CI (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AHxn per mole of NH CI. ΔΗ O exothermic O endothermic O neither kJ kJ mol : X Ś

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