PLEASE HELP FAST!! NO LINKS! In the equation:

2H₂ + 1O₂ →→ 2H₂O

If you change the 2H₂ to 3H₂ molecules and balance the equation, which statement is correct?

A. The result of the equation will be the same.

B. The equation will produce three molecules of water.

C. It is not possible to produce water without leftover molecules.

D. Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules.

i just got this problem. it's 90.3

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%