i need belp with these two please

What will the sign on S be for the following reaction and why? 2Mg(s)+O2(g)2MgO(s) A) Positive, because there is a solid as a product. B) Positive, because there are more moles of reactant than product. C) Positive, because it is a synthesis reaction. D) Negative, because there are more moles of gas on the reactant side than the product side. E) Negative, because there are more moles of reactant than product. What is G for the reaction CaO(s)+CO2(g)CaCO3(s)