Predict the sign of Ssys for each of the following processes: (a) Molten gold solidifies. (b) Gaseous

Question:

Predict the sign of ΔSsys for each of the following processes:
(a) Molten gold solidifies.
(b) Gaseous Cl2 dissociates in the stratosphere to form gaseous Cl atoms.
(c) Gaseous CO reacts with gaseous H2 to form liquid methanol, CH3OH.
(d) Calcium phosphate precipitates upon mixing Ca(NO3)2(aq) and (NH4)3PO4(aq).