Answer: if it has to have a definite physical and chemical properties. Mixture is when two atoms combine but not chemically.
Explanation:
It would be atomic masses of the same atoms, and that atoms will be isotopes.
Answer:
The heat of formation of H2O(g) is likely to be-242,8KJ.
Explanation:
The heat of formation of H2O(g) will be slightly lower than the heat of formation of H2O(1)as some energy is released during condensation of water vapour to liquid water.
