The study of the kinetics of real systems can be complicated.For example, there

Question

The study of the kinetics of real systems can be complicated.For example, there are several ways which O_3 can be converted to O_2. One such reaction is NO_2 + O_3 rightarrow NO_3 + O_2 Determine the rate law and rate constant for this reaction. In a copper plating experiment in which copper metal is deposited from a copper (II) ion solution, the system is run for 2.6 hours at a current of 12.0 A. What mass of copper is deposited? (F = 96. 485 C/mol). Cu^2+ (aq) + 2e^- rightarrow Cu (s) 9. Express the following reaction using galvanic cell notation 3 Pb(s) + 2 Au^3+ (aq) rightarrow 2 Au (s) + 3Pb^21+ (aq) 10. Compute the binding energy of the N nuclcous, which has an experimental mass of 14.003074 u. Mass of Proton = 1.007825 u. Mass of Neutron + 1.0086654 u)

Explanation / Answer

8)

Mass of copper m = ?

Molar mass of copper M = 63.5 g/mol

time t = 2.6 h = 2.6 x 60 x 60 s

current c = 12 A

valancy of copper z = +2

From Faraday's 1st law,

m = Mct/zF where F = Faraday constant

Substitute all the values,

m = (63.5 g/mol) (12 A) (2.6 x 60 x 60 s )/ (2) (96485 C/mol)

= 36.96 g

m = 36.96 grams

Therefore,

mass of copper deposited = 36.96 grams

9)

Cell notation: anode II cathode

Pb I  Pb2+ II Ag3+ I Au

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