Hey I realize someone just replied to this question but their explanation wasn\'

Question

Hey I realize someone just replied to this question but their explanation wasn't detailed enough for me. Can someone please show me how to do this problem? 0 3. When 21.45 g of potassium nitrate was dissolved in water in a calorimeter, the temperature fell from 25.00°C to 14.14°C If the heat capacity of the calorimeter and its contents is 682 Jrc, what is AHan for the dissolution of potassium nitrate in kJ/mol? Write the equation for this reaction: Is it exothermic or endothermic? Draw theenthalpy diagram for the dissolution of KNO3 Gol: Anon.- I mal kro What bonds are being formed? What bonds are being broken? Which bonds must be stronger? OK, now solve the problem: Hs 15500t3Is.du g

Explanation / Answer

3. Equation for reaction : KNO3(s) +H2O(l) ----> KOH(aq) + HNO3(aq)

Since the temperature of solution fell, the reaction is endothermic. Heat is absorbed from surrounding for dissolution of salt.

K-O and O-H bonds are formed here.

K-N bond and H-O bonds are broken

Bonds on the reactant end are stronger and thus the reaction is endothermic, produce less energy on hydration of ions than required for bond breaking to form ions.

dHsoln = mCpdT = 21.45 x 682 x (25 - 14.4) = 155.067 kJ

In kJ/mol dHsoln = (101.103/21.45) x 155.067 = 731.00 kJ/mol

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---