B and D is out. It cant be A because heat of combustion is substance not compound. So the answer is D.
Answer:

Explanation:
Hello,
In this case, for the dissociation of calcium fluoride:

The equilibrium expression is:
![Ksp=[Ca^{2+}][F^-]^2](https://tex.z-dn.net/?f=Ksp%3D%5BCa%5E%7B2%2B%7D%5D%5BF%5E-%5D%5E2)
In such a way, via the ICE procedure, including an initial concentration of calcium of 0.01 M (due to the calcium nitrate solution), the reaction extent
is computed as follows:

Thus, the molar solubility equals the reaction extent
, therefore:

Regards.
Has only 7 electrons so it want to bond with other elements so its very reactive and unstable. Hope this helps
Answer:
A
Explanation:
B and D have to do with plants
and C has nothing to do with cellular resporation.