Predict in which of the following entropy increases / decreases.(i) Te

1.	Predict in which of the following entropy increases / decreases.(i) Temperature of a crystalline solid is raised from 0 K to 115 K. (ii) 2NaHCO3 → Na2CO3(s) +CO2 (g) + H2O(g) (iii) H2(g) → 2H(g)
Answer» (i) When temperature is raised, disorder in molecules increases and therefore entropy increases. (ii) Reactant is a solid and hence has low entropy. Among the products there are two gases and one solid so products represent a condition of higher entropy. (iii) Here 2 moles of H atoms have higher entropy than one mole of hydrogen molecule.

Predict in which of the following entropy increases / decreases.(i) Temperature of a crystalline solid is raised from 0 K to 115 K. (ii) 2NaHCO3 → Na2CO3(s) +CO2 (g) + H2O(g) (iii) H2(g) → 2H(g)

Answer»

(i) When temperature is raised, disorder in molecules increases and therefore entropy increases.

(ii) Reactant is a solid and hence has low entropy. Among the products there are two gases and one solid so products represent a condition of higher entropy.

(iii) Here 2 moles of H atoms have higher entropy than one mole of hydrogen molecule.

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Predict in which of the following entropy increases / decreases.(i) Temperature of a crystalline solid is raised from 0 K to 115 K. (ii) 2NaHCO3 → Na2CO3(s) +CO2 (g) + H2O(g) (iii) H2(g) → 2H(g)

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