Firefox File Edit View History Bookmarks Yahoo! Tools Window Help O S 55% D Thu

Question

Firefox File Edit View History Bookmarks Yahoo! Tools Window Help O S 55% D Thu Mar 19 8 46 PM a E WWN7496: Homework 9- d... x ii 3 smartwork wwnorton.co 397563 m/sw/mod/smartwork/view.php?id a Search Search YAHOO Yahoo Search SMARTWORK 3.0 l WWN7496 HOMEWORK 9- DUE FRIDAY, 3/20/15 AT 55 PM t Print Calculator Periodic Table Ebook Question 8 of 18 (1 point) The addition of 116 g potassium fluoride to 597 mL of water (d* 1.00 g/mL) causes the temperature to rise 3.3°C. What is the Arkn for the dissolution of KF? Assume that the specific heat capacity of the solution is the same as that of water. Be sure to use the mass of the entire solution. Number kJ mol v Check Answer View Solution Hin

Explanation / Answer

deltaH = mCpdT. It is assumed that the dissolution of KF in water is at STP.

Cp = 4.1814 J/g-K and mass of solution,m is 713g.

Therefore, deltaH = 713*4.1814*3.3 = 9.838 kJ

Concentration of KF is (116/58.1)/0.597 = 3.344 M

Therefore, deltaH for 1 M solution = 2.942 kJ/mol

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.