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Grade 11 Chemistry Effective Homework 2: Industrial Production of Sulfuric Acid | Brief Solutions
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Labels: E = worked example, C = class practice, H = homework; P1-P4 refer to original PDF pages. Other labels follow the original question or section numbering.
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1 Main reason to purify furnace gas before the contact-process converter. Show answer
2 Choose incorrect statements about sulfuric-acid manufacture. Show answer
3 Choose correct statements from the converter and heat-exchanger diagram. Show answer
4 Which sulfur-dioxide oxidation condition is not industrially appropriate? Show answer
5 Which operation is explained by Le Chatelier's principle? Show answer
6 Choose correct operation-and-reason pairs in sulfuric-acid manufacture. Show answer
7 Choose the incorrect statement about temperature, pressure and recycling in SO2 oxidation. Show answer
8 Methyl-formate synthesis conversion-temperature curve: choose incorrect statements. Show answer
9.1 Pyrite-to-sulfuric-acid process: choose the incorrect statement. Show answer
9.2 Two other functions of concentrated sulfuric acid in apparatus B, besides mixing gases. Show answer
Dry the gas; observe bubbles to monitor and regulate gas flow.
9.3 Why temporarily remove the burner when the catalyst becomes red hot, besides catalyst activity? Show answer
The exothermic reaction sustains heating; excessive temperature shifts equilibrium backward and lowers SO2 conversion.
9.4 D produces a white precipitate while fuchsin in E still decolorizes. Choose the solution in D. Show answer
10.1 Combine CO2-to-CO conversion and methanol synthesis: find overall enthalpy and the equilibrium expression. Show answer
$-49\ \mathrm{kJ\,mol^{-1}}$;$K=\dfrac{c(\mathrm{CH_3OH})c(\mathrm{H_2O})}{c(\mathrm{CO_2})c^3(\mathrm{H_2})}$
10.2 At constant volume, choose correct statements for $\mathrm{CO_2+H_2\rightleftharpoons CO+H_2O}$. Show answer
10.3 How does the graph show that equilibrium has not been reached at $240^\circ\mathrm C$? Show answer
Actual CO2 conversion is below the equilibrium value at that temperature.
10.4 Why does equilibrium CO2 conversion fall from $220$ to $240^\circ\mathrm C$? Show answer
Exothermic methanol formation dominates in this range, and heating shifts its equilibrium backward.
10.5 Why does actual methanol selectivity fall with heating in this range? Show answer
Heating favors the endothermic CO-forming reaction, increasing the CO share of carbon products.
10.6 Choose measures that improve equilibrium conversion of CO2 to methanol. Show answer
10.7 Which curve represents the methanol mole fraction among carbon products? Show answer
10.8 Directly making methanol and oxygen from CO2 and water has $\Delta H=676.48$ kJ/mol. Assess thermodynamic feasibility. Show answer
It is not spontaneous under the stated thermodynamic model: $\Delta H>0$ and $\Delta S<0$, hence $\Delta G>0$. An external energy input is required.
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