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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: MagicSeaweed on April 20, 2022, 01:44:43 AM

Title: Thermodynamics Question
Post by: MagicSeaweed on April 20, 2022, 01:44:43 AM

A saturated 0.1mol.L-1 KNO3 solution was prepared by placing KNO3 crystals in 5mL water in a test tube and by heating the test tube up to ~95 °C. The test tube is allowed to cool down and at 85 °C small crystals start to appear in the solution. 5 mL water is added and the test tube is heated again in order to dissolve all the crystals. The test tube is again allowed to cool down and at 49 °C small crystals start to appear in the solution. Calculate the following thermodynamical entities of the dissolution process of KNO3:
(a)  standard enthalpy of dissolution [6½]

Title: Re: Thermodynamics Question
Post by: Borek on April 20, 2022, 02:46:48 AM

Please read the forum rules (https://www.chemicalforums.com/index.php?topic=65859.0). You have to show your attempts at answering the question/solving the problem to receive help, it is a forum policy.

Title: Re: Thermodynamics Question
Post by: MagicSeaweed on April 20, 2022, 04:12:20 AM

I apologize, I forgot to include it.

Title: Re: Thermodynamics Question
Post by: mjc123 on April 20, 2022, 03:17:51 PM

Your calculation at the end makes no sense. What is the equation you are trying to use, and what values are you putting into it?