Question

What is the molecular mass of magnesium hydroxide?

Answer 1

Hint: The mass of a molecule is measured in daltons and is called molecular mass (m) (Da or u). Because they contain various isotopes of an element, multiple molecules of the same chemical may have different molecular weights. The related quantity relative molecular mass is a unitless ratio of a molecule's mass to the unified atomic mass unit (also known as the dalton) as defined by IUPAC. The molecular mass and relative molecular mass are not the same as the molar mass, but they are linked. The molar mass is stated in g/mol and is defined as the mass of a particular substance divided by the quantity of that substance.

Complete answer:
 $ Mg{{\left( OH \right)}_{2}} $ is the chemical formula for magnesium hydroxide, an inorganic molecule. It is found as the mineral brucite in nature. It's a white solid with a poor water solubility ( $ {{K}_{sp}}~=\text{ }5.61\times {{10}^{-1}}^{2} $ ). Magnesium hydroxide is included in several antacids, including milk of magnesia. When a solution of several magnesium salts is mixed with alkaline water, solid $ Mg{{\left( OH \right)}_{2}} $ is precipitated.
 $ M{{g}^{2+}}~+\text{ }2O{{H}^{-}}~\to \text{ }Mg{{\left( OH \right)}_{2}} $
In most cases, the gut absorbs just a tiny quantity of magnesium from magnesium hydroxide (unless one is deficient in magnesium).
Atomic mass of Magnesium = 24.3 amu
Atomic mass of Hydrogen = 1.008 amu
Atomic mass of Oxygen = 16 amu
Molecular mass of hydroxide = $ 1.008+16=17.008amu $
Molecular mass of Magnesium hydroxide = Mg and 2 hydroxide = $ 24.3+2(17.008)=58.316\text{ }amu $ .

Note:
Magnesium hydroxide is available in a variety of forms for medical usage, including chewable tablets, capsules, powder, and liquid solutions, which are occasionally flavoured. These antacids are used to neutralise stomach acid and alleviate indigestion and heartburn. It can also be used as a laxative to help with constipation. The osmotic force of magnesia functions as a laxative, drawing fluids from the body. High doses might cause diarrhoea and decrease the body's potassium supply, which can result in muscular cramps.