Question

Given the following electrolytic cell:

The current is discharged into the electrolytic cell containing the solution CuSO_4(aq) 1.0M at 25 ^oC. During the operation of the cell, copper Cu_(s) is deposited on one electrode and oxygen O2_(g) gas is released, near the second electrode.

O_2(g) + 4H₃O⁺_(aq) + 4e^-$\rightarrow$ 6H₂O_(l) E^o= 1.23V

Cu²⁺_(aq) + 2e^-$\rightarrow$ Cu_(s)    E^o= 0.34V

A. The current in the cell is 1.5 amperes. The current is streamed in 40 minutes.
i. Calculate the mass of copper in grams that have sunk. Show calculations.
ii. What is the volume in liters of oxygen gas released on 25 ^oC under pressure of 1.16 atm. Show calculations.

B. Methane gas reacts with chlorine gas according to the reaction given below:

CH_4(g) + 2Cl_2(g) → CH₂Cl_2(g) + 2HCl_(g)

The following mechanism is proposed for the reaction (all substances in the gaseous state):

Step 1: Cl₂ ⇄ 2Cl equilibrium is fast
Step 2: CH₄ + Cl → CH₃ + HCl Slow step
Step 3: CH₃ + Cl₂ → CH₃Cl + Cl Quick step
Step 4: CH₃Cl + Cl → CH₂Cl₂ + H Quick step
Step 5: H + Cl → HCl  Quick step
i. Does CH₃Cl function as a catalyst or as an intermediate in the proposed mechanism? Explain.

ii. What is the order of response to Cl_2(g) and CH_4(g) according to the proposed mechanism? Explain.

Thanks!

Power source Cu2eCu (aq)

Answer 1

Cu Omin b00 Conlomb dugeritud Cu x 96 500 Cautonks Coulonb's 92,0 Anner 63. 36s0 192.000 P

Cu 273 -0.0313myf Ahm ner lowert gl Ordan K K at laas Plang'

Con tants rea ctia So rday to clis