Edexcel IAL Chemistry 12.3 Entropy, temperature and physical state

Sketch a rising entropy–temperature curve with vertical steps at melting and boiling, then use state and molecular complexity when ordering standard values.

Exam points

Sketch entropy against temperature with upward jumps at melting and boiling points.
Order molar entropies using physical state, temperature and molecular complexity.

[Maximum number: 1]

In which series does the standard molar entropy of the compounds increase?

$\mathrm{CaO}(\mathrm{s})<\mathrm{H}_{2} \mathrm{O}(\mathrm{l})<\mathrm{CO}_{2}(\mathrm{~g})<\mathrm{SO}_{2}(\mathrm{~g})$

$\mathrm{CaO}(\mathrm{s})<\mathrm{H}_{2} \mathrm{O}(\mathrm{l})<\mathrm{SO}_{2}(\mathrm{~g})<\mathrm{CO}_{2}(\mathrm{~g})$

$\mathrm{SO}_{2}(\mathrm{~g})<\mathrm{CO}_{2}(\mathrm{~g})<\mathrm{H}_{2} \mathrm{O}(\mathrm{l})<\mathrm{CaO}(\mathrm{s})$

$\mathrm{CO}_{2}(\mathrm{~g})<\mathrm{SO}_{2}(\mathrm{~g})<\mathrm{H}_{2} \mathrm{O}(\mathrm{l})<\mathrm{CaO}(\mathrm{s})$

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12.3—The entropy of a substance increases with temperature, that entropy increases as solid → liquid → gas and that perfect question 1