A student dissolves 10.4 g of potassium chloride (KC1)in 300. g of water in a well-insulated open cup. He then observes

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A Student Dissolves 10 4 G Of Potassium Chloride Kc1 In 300 G Of Water In A Well Insulated Open Cup He Then Observes 1 (161.64 KiB) Viewed 55 times

A student dissolves 10.4 g of potassium chloride (KC1)in 300. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 23.0 °C to 20.8 °C over the course of 4.3 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: KCl(s) → → K+ (aq) + Cl¯ (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 the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. 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 ΔΗ per mole of KC1. rxn П exothermic endothermic neither kJ kJ mol x10 X Ś ?