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# Rate of reaction

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The numerical value of the rate constant for the gaseous reaction

2N2O5------- 4NO2+ O2

was found to be 5.8*10-4. The initial concetration of N205 was 1.00mol/L. Assuming all measurements are recorded in seconds, determine the tim required for the reation to be 60% complete if the reaction is second order.

2. For each of the following cells write a balaced vell redox equation and calculate E(upper little circle)

a. Ag(s) / Ag2S / S(- 2)(aq) // HClO(aq), H(+ 1)(aq) / Cl2(g) / Pt
b. Pt / Cr2O7(- 2)(aq), Cr(+3)(aq), H(+1) // Cl(-1)(aq) / Cl2(g) / Pt
c. Fe / Fe (+3)(aq) // Cl(-1) / Hg2Cl2(s) / Hg(l)

Ag2S(s) + 2e- -------------- 2 Ag(s) + S(-2) E(upper little circle)= -0.71 V

2HCLO + 2H(+1) +2e- ---------- Cl2 + 2H2O E = 1.63

Hg2Cl2 (s) + 2e- ---------------- 2Hg(l) + 2Cl(-1) E = 0.27

Fe(+3) + 3e- --------------Fe E = -0.04

3. a). Calculate the number of moles of electrons needed to produce 5.12g of copper from the electrolysis of a solution of CuSO4.

b). How much time is required to produce 200g of alumimun metal for molten aluminum oxide dissolved in cryolite, if you use a 12.0 amp current.

https://brainmass.com/chemistry/physical-chemistry/rate-of-reaction-61046

#### Solution Summary

It provides detailed explanations of calculating rate of reaction, balancing redox equations.

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## Lab Report: Reaction Order and Rate Laws

Objective: To study the effect of reactant concentration on the rate of the reaction between sodium thiosulfate and hydrochloric acid and to determine the order of each reactant and the rate law for the reaction.

2 HCI(aq) + NaS2O3 (aq) --> S(s) + SO2 (aq) + H2O(l) + 2NaCL(aq)

Calculations:

(a) Calculate the initial and final concentrations as needed to complete tables 1 and 2.
(b) Calculate the average reaction time for each reaction by adding the times for the two trials and dividing by 2.
(c) Calculate the reaction rate by taking the inverse of the average reaction time.
(d) Write the rate law for the reaction.

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