1) Balanced chemical reaction: Cl₂ + 2NaI → 2NaCl + I₂.
Chlorine and iodine are diatomic molecules.
2) Balanced chemical reaction: 2NH₃ → N₂ + 3H₂.
Nitrogen and hydrogen are diatomic molecules.
3) Balanced chemical reaction: 4Na + O₂ → 2Na₂O.
Sodium in compounds has oxidation number +1 and oxygen -2.
Answer: Calories
Explanation: One calorie is the amount of energy required to raise one gram of water one degree Celsius
Once criterion of knowing whether the reaction is spontaneous or not, is by looking at the sign of delta G. If it's negative, the process is spontaneous, and vv. The formula for delta G is
G = H - TS
G = 147 kJ - (-67/1000 kJ)*(149 + 273 K)
G =175 kJ
Thus, the process is non-spontaneous.
