Question

Milk of magnesia has the chemical formula Mg(OH)2. What is the mass of 3.2 moles of milk of magnesia? The molar Mass of magnesium is 24.3 grams per mole. The molar mass of hydrogen is 1.0 grams per mole. The molar mass of oxygen is 16.0 grams per mole

Answer 1

186.6 is the answer.       

Answer 2

First let us compute for the molar mass of Mg(OH)2.

molar mass = 24.3 + 2 (16) + 2(1.0)

molar mass = 58.3 g/mol

So the mass is then:

mass = 3.2 mol * (58.3 g/mol)

mass = 186.56 grams