Question

What is the molecular weight (mass) for $KOH$?

Answer 1

We need to remember that the molecular weight is equal to the sum of atomic mass of every atom which is present in a compound or the molecule. And the molecular weight is another term of molar mass which is used for the molecular compounds, and it will not depend on the size of the sample. The molecular weight is expressed in terms of kg/mol. Potassium hydroxide is a chemical compound with formula, $KOH$ which contains the atoms, potassium, oxygen and hydrogen.

Complete answer:
As we know that potassium hydroxide is a chemical compound having the chemical formula, $KOH$ which is also known as caustic soda with white in colour. The molecular weight of potassium hydroxide is equal to $56g/mol$. It can be found out by adding the molecular mass of each element present in the sample. Hence here the number of potassium is equal to one, the number of hydrogen is equal to one, and the number of oxygen is equal to one. Therefore,
$Potassium = 39 \times \left( 1 \right) = 39$
$Hydrogen = 1 \times \left( 1 \right) = 1$
$Oxygen = 16 \times \left( 1 \right) = 16$
Here we have to add each of the masses. Hence, we will get the molecular weight of potassium hydroxide.
$molecular weight = 39 + 1 + 16 = 56g/mol$

Note:
The molecular weight of potassium hydroxide is equal to $56g/mol$. The potassium hydroxide are, highly hygroscopic in nature and it is soluble in water. But it is highly exothermic. And the potassium hydroxide is a strong base and this is an acceptable solvent to dissolve organic material. This is a highly corrosive compound when it is reacted with moist air and there is a formation of explosive and flammable hydrogen gases.