If 5.0125 g of calcium chloride (CaCl2) is dissolved in 100.0 mL of water, the following data are collected: starting temperature is 22.5 °C, final temperature is 27.9 °C.  Calculate the enthalpy of solution (∆Hsolution) in Joules.  You may assume a density of 1.00 g/mL for the solution and specific heat is 4.18 J/(g×°C).  Given: q = - m · Cp · ∆T and ∆Hsolution =q/moles solute   a.) is it exothermic or endothermic and how do you know?

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.61QE: When 7.11 g NH4NO3 is added to 100 mL water, the temperature of the calorimeter contents decreases...
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  1. If 5.0125 g of calcium chloride (CaCl2) is dissolved in 100.0 mL of water, the following data are collected: starting temperature is 22.5 °C, final temperature is 27.9 °C.  Calculate the enthalpy of solution (∆Hsolution) in Joules.  You may assume a density of 1.00 g/mL for the solution and specific heat is 4.18 J/(g×°C). 

Given: q = - m · Cp · ∆T and ∆Hsolution =q/moles solute  

a.) is it exothermic or endothermic and how do you know?

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