Question 49

The mass defect for LI-6 nucleus is -0.03434 g/mol. Calculate the atomic mass of Li-6

Question 48

THe sun radiates 3.9 E23 J of energy into space every second. What is the rate at which mass is lost from the sun?

Question 47

An unknown metal M is electrolyzed. It took 74.1 s for a current of 2.00 amp to plate out 0.107g of the metal from a solution containing M(NO3)3. Identify the metal.

Question 46

Calculate the value of the equilibrium constant for teh reaction of zinc metal in a solution of silver nitrate at 25 C.

Question 45

Define oxidation and reduction in terms electron loss or gain.

Question 44

Ethanethiol is commonly added to natural gas to provide the “rotten egg” smell of a gas leak. The boiling point of ethanethiol is 35C and its heat of vaporization is 27.5 kJ/mol. What is the entropy of vaporization for this substance?

Question 43

Is salt dissolving in wate r a spontaneous process?

Question 42

Calculate the soluilbity of solid Ca3(PO4)2  (Ksp= 1.3 E-32) in a 0.20 M NaPO4 solution.

Question 41

Calculate the molar solubility of Co(OH)3, Ksp= 2.5 E-43.

Question 40

The solubility of the ionic compound M2X3, having a molar mass of 288 g/mol, is 3.6 E-7 g/L. Calculate the Ksp value of the compound.