Please help!

Which statement is NOT correct?

a) In an ionic compound, a metal and a non metal form a compound, and electrons are transferred from one to the other.

b) In an ionic compound, a metal and a polyatomic ion form a compound, and electrons are shared.

c) In both ionic and molecular compounds, valence electrons take part in bonding.

d) In a molecular compound, a non-metal and a non-metal form a compound, and electrons are shared

D is the answer

Explanation:

I'm pretty sure a molecular compound doesn't form between 2 non metals

...I think, but I can't remember

c most likely

hop this let me know if it is wrong

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%