iPad 3:14 PM 81%- Exp. 2 Prelab Freezing Point Depression: Attempt 1 2.00000 poi

Question

iPad 3:14 PM 81%- Exp. 2 Prelab Freezing Point Depression: Attempt 1 2.00000 points UESTION 1 How many moles of ions are present in an ideal solution that is produced by dissolving 20.9 g of Cu(NO312 in 128 g of water? 2.00000 points Saved UESTION 2 Why is the slope of the line when crystallization is occuring in a solution not zero? O As heat is being removed from the system the temeprature will drop. O As the pure solvent crystallizes, the composition of the solution changes and the freezing point changes O Freezing is an exothermic procees, so as energy is lost, the temperature drops. OFreezing is an endothermic process, so as energy is converted from kinetic to potential energy, the temperature drops. The

Explanation / Answer

Ans 1 :

One mole of Cu(NO3)2 dissociates into 1 mole of Cu2+ and 2 mole of NO3- , so a total of three mol of ions.

Number of mol of Cu(NO3)2 = 20.9 / molar mass

= 20.9 / 187.56

= 0.111 mol

So number of ions = 0.111 x 3 = 0.333

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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