4.8 g/cm3 with sig figs since it's mass/volume you divide 76 grams by 16 cm3
The answer is (4), (3) is merely a change in composition, thus not chemical but physical.
Answer: (4).
Answer:
In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.
Idk but look it up on google
