For which of the following reactions is delta S degree > 0. 2NH_3(g) + 2O_2(g) r

Question

For which of the following reactions is delta S degree > 0. 2NH_3(g) + 2O_2(g) rightarrow N_2O(g) + 3H_2O(I) CH_4(g) + H_2O(g) rightarrow 3H_2O(g) rightarrow 3H_2(g) + CO(g) NH_4Cl(s) rightarrow NH_3(g) + HCl(g) 2H_2O(g) + 2Cl_2(g) rightarrow 4HCl(g) + O_2(g) 2CO(g) + O_2(g) rightarrow 2CO_2(g) Which of the following transformations represent an increase in the entropy of the system. 40g C_5H_12 (liquid, 309K) rightarrow 40 g C_5H_12(gas, 309K) 30 g Fe (solid, 1.808 times 10^3K) rightarrow 30 g Fe (liquid, 1.808 times 10^3K) 1 mol N_2 (0.739 atm, 427 K) rightarrow 1 mol N_2 (0.739 atm, 214 K) 40 g C_5H_12 (liquid, 294K) rightarrow 40 g C_5H_12 (liquid, 159K) 3 mol Xe(7.42 L, 217 K) rightarrow 3 mol Xe (14.8 L, 217K)

Explanation / Answer

greater the disorderness of the system greater is the entropy. The following reactions involve in increase in entropy.

* CH4 + H2O -------------> CO + 3H2

* NH4Cl ---------> NH3 + HCl

* 2 H2O + 2 Cl2 ------> 4 HCl + O2

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the follwoing pocesses involve in increase in entropy.

1

2

4

entropy order:

gas > liquid > solid

more number of moles of gas more is the entropy.

higher the temerature higher is the entropy.

higher the volume higher is the entropy

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