Provide the mathematical equation for entropy change.

What is the change in entropy when an ideal gas expands into a vacuum?

The true statement amongst the following is

For a spontaneous process,the correct statement is

For which of the following reactions will $\Delta S$ be maximum?

The standard entropies of $CO_{2(g)}$,$C_{(s)}$,and $O_{2(g)}$ are $213.5$,$5.740$,and $205 \ J \ K^{-1} \ mol^{-1}$ respectively. The standard entropy of formation of $CO_{2(g)}$ is $...... \ J \ K^{-1} \ mol^{-1}$.