How I do this? What is the molar concentration of a 50% NaOH solution? The density of
solution is 1.525 g/mL and
Mr(NaOH) = 40 g/mol.

A) 30.50 mol/L
B) 9531 mmol/L
C) 38.13 mol/L
D 19.06 mol/L
E) no answer is correct

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%

i think its 5049.

i hope this !