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When a 2.45-g sample of solid sodium hydroxide dissolves in 41.2 g of water in a coffee-cup calorimeter

When a 2.45-g sample of solid sodium hydroxide dissolves in 41.2 g of water in a coffee-cup calorimeter

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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When a 2.45-g sample of solid sodium hydroxide dissolves in 41.2 g of water in a coffee-cup calorimeter the temperature rises from 20.00 oC to 34.77 oC. Calculate H in kJ/mol NaOH for the solution process.

 

NaOH(s)  Na+(aq) + OH-(aq)

 


The specific heat of water is 4.18 J/g-K.



Hsolution =______  kJ/mol NaOH.

Expert Solution
Step 1 introduction

 

In a coffee cup calorimeter 

Amount of heat released due to reaction is equal to heat abosorbed by solution 

qrxn = - qsolution 

Now heat abosorbed by solution can be calculated by 

qsol  = -  msol x Ssol  x  ∆Tsol 

 

Where 

msol = mass of solute + mass of solvent 

         = 2.45 g + 41.2 g 

         = 43.65 g 

 

S = specific heat = 4.18 J/g K 

 

∆T sol = ( 307.77 K  - 293 K) 

           = 14.77 K 

 

Where 0°C = 273 K

 

 

 

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