In a spontaneous process,the entropy of the system and its surroundings

The process with negative entropy change is

For chemical reactions,the calculation of change in entropy is normally done:

Which of the following reactions has a positive entropy change?

Given the entropy of $H_2$ and $HBr$ are $130.6 \, JK^{-1}$ and $198.5 \, JK^{-1}$ respectively,calculate the entropy of $Br_{2(g)}$ in the reaction $H_{2(g)} + Br_{2(g)} \rightarrow 2HBr_{(g)}$ where $\Delta S^{o} = 20.1 \, JK^{-1}$.

Which of the following reactions will have the value of $\Delta S$ with a negative sign?