chemistry molarity

Question

What is the % water inmanganese(II) chloride tetrahydrate? 

Answer 1

Formula for manganese(II) chloride tetrahydrate = MnCl₂ • 4H₂O

Finding the molar mass:

Mn = 54.9

2Cl = 70.9

4H₂O = 72

197.8 g / mol = molar mass

% H₂O = mass H₂O / total mass (x100%)

% H₂O = 72 g / 197.8 g (x100%)

% H₂O = 36.4%