# Entropy Change for Reactions

Using the data sheet (see attachment) calculate delta S values for the following reactions. In each case explain the sign of delta S.

N2H4(g) + H2(g) --> 2NH3(g)

2Al(s) + 3Cl2(g) --> 2AlCl3(g)

Mg[OH]2(s) + 2Hcl(g) --> MgCl2(s) + 2H20(l)

2CH4(g) --> C2H6 + H2(g)

https://brainmass.com/chemistry/energetics-and-thermodynamics/entropy-change-reactions-538265

#### Solution Preview

1. dH = entropy of products - entropy of reactants

dH = [2x 192.5] - [238.5 + 130.58] = 15.92 J/molK

There is a small increase in entropy as the gases become somewhat smaller and hence more ...

#### Solution Summary

The entropy change dS is calculated for some reactions. The sign of the entropy change is also explained in each case.

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