Carbon disulfide, $$\(\mathrm{CS}_{2}\)$$, is flammable and reacts readily with oxygen, as shown in reaction 1. $$\[ \text { reaction } 1 \quad \mathrm{CS}_{2}(\mathrm{~g})+3 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{SO}_{2}(\mathrm{~g}) \]$$ Table 3.1 shows the standard enthalpy of formation, $$\(\Delta H_{\mathrm{f}}^{\ominus}\)$$, and the standard entropy, $$\(S^{\ominus}\)$$, for some substances. Calculate the standard Gibbs free energy change, $$\(\Delta G^{\ominus}\)$$, in $$\(\mathrm{kJ} \mathrm{mol}^{-1}\)$$, for reaction 1 at $$\(25^{\circ} \mathrm{C}\)$$. $$\[ \Delta G^{\ominus}=\ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \mathrm{kJ} \mathrm{mol}^{-1}\]$$
Exam No:9701_s24_qp_42 Year:2024 Question No:3(a)
Answer:
Knowledge points:
23.3.1 define the term entropy, S, as the number of possible arrangements of the particles and their energy in a given system
23.3.2.1 during a change in state, e.g. melting, boiling and dissolving (and their reverse)
23.3.2.2 during a temperature change
23.3.2.3 during a reaction in which there is a change in the number of gaseous molecules
23.3.3 calculate the entropy change for a reaction, ΔS, given the standard entropies,
Solution:
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