What will the sign on delta S be for the following reaction and why? 2 MgO (s) -> 2 Mg (s) +O2(g) Positive, because there are more moles of gas on the…

What will the sign on delta S be for the following reaction and why?

2 MgO (s) -> 2 Mg (s) +O2(g)

1. Positive, because there are more moles of gas on the product side than the reactant side, it is a gas-evolving reaction.
2. Negative, because there are more moles of product than reactant.
3. Negative, because there are more moles of gas on the reactant side than the product side.
4. Not sure, more information needed