(BONUS QUESTION) In the copper complexes investigated, the water and ammonia molecules act as Lewis bases (electron pair donors)
; they provide both of the electrons that form the covalent bonds between the Cu2+ ion and each ligand. Which ligand (H2O or NH3) is the stronger Lewis base? Explain your answer in terms of your answers for questions 3a and 3b. (hint: the poorer an oxidizing agent a species is, the harder it it to reduce that species. Hint #2: the copper complexes are reduced by gaining an electron.)
1 answer:
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The reaction is given as:
Here, two moles of copper nitrate reacts with four moles of potassium iodide to give two moles of copper iodide, one mole of iodine and four moles of potassium nitrate.
First, calculate the number of moles of copper nitrate.
Number of moles is equal to the product of molarity and volume of solution in litre.
Number of moles =
(1 L =1000 mL)
=
Copper nitrate requires = mole of potassium iodide
= of potassium iodide
Volume of solution in litre =
Thus, volume of potassium iodide is =
=
1 L =1000 mL
Volume of potassium iodide in mL =
Hence, 0.2089 M potassium iodide consist of sufficient potassium iodide to react with copper nitrate in 3.88 mL of a 0.3842 M solution of copper nitrate .
Answer:
12.78 kJ
Explanation:
The correct balanced reaction would be
Mass of methanol =
Moles of methanol can be obtained by dividing the mass of methanol with its molar mass
Enthalpy change for the number of moles is given by
The change in enthalpy is 12.78 kJ.