1. Consider the following series of elementary reactions #1: I 2 -> 2I #2: CH 4
ID: 881564 • Letter: 1
Question
1. Consider the following series of elementary reactions
#1: I2 -> 2I
#2: CH4 + I -> CH3 + HI
#3: CH3 + I -> CH3I
a. Write the overall chemical reaction for this series.
b. Determine the moleculariety for each elementary reaction.
c. Identify which species in the elementary reaction series are reaction intermediates.
d. Write the rate law for the overall reaction if the 1st elementary reaction is the rate-determining step.
e. Write the rate law for the overall reaction if the 1st elementary reaction is a fast equilibrium and the 2nd elementary reaction is the rate-determining step.
2. Write a balanced overall reaction and calculate Eocell for the following electrochemical cell.
Pt | Sn2+ (1 M), Sn4+ (1 M) | | NO3- (1 M), H+ (1 M), NO (1 atm) | Pt
Explanation / Answer
a. CH4 + I2 --> CH3I + HI
b. moleculariety of a. 1 , b. 2, C.2
c. CH3 , I
D. Rate = k[I2]
e. k1 = [I]^2/[I2]
[I] = (K*[I2])^1/2
Rate = K[CH4][I]
Rate = K[CH4] (K*[I2])^1/2
Rate = K2[CH4][I2]^1/2
2. 3Sn^2+ 2NO3^- + 8H+ ---> 2NO + 4H2O + 3Sn^4+
E0cell = Ecathode - Eanode
= 0.96 - 0.15 = 0.81 v
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