Question

Change in entropy is negative for

• A. Bromine $\left(\ell\right)\to$ Bromine $\left(g\right)$
• B. $C\left(s\right) + H_2O\left(g\right)\to CO\left(g\right) + H_2\left(g\right)$
• C. $N_2\left(g, 10 \,atm\right) \to N_2\left(g, 1 \,atm\right)$
• D. $Fe \left(1 \,mol, 400 K\right)\to Fe \left(1 \, mol, 300 K\right)$

Answer 1

Answer: (D)

$\Delta S=\Sigma n \Delta S$ (Products) $-\Sigma n \Delta S$ (Reactants) In option (d) change in entropy is negative because at higher temperature degree of randomness is high.