Question

What is the molecular weight (mass) for $\text{KOH}$?

Answer 1

Step1. Molecular weight

• Molecular weight is the sum of atomic weight, measured in amu.
• The mass of one carbon atom is equal to the atomic mass unit (formerly abbreviated as 'amu,' but now spelled as 'u' – unified mass) according to the latest IUPAC recommendation.

Step2. The formula for the molecular weight of $\text{KOH}$

The molecular weight of $\text{KOH}$=$\text{The atomic weight of K+ The atomic weight of O+ The atomic weight of H}$

Step3. Calculation of molecular weight of $\text{KOH}$

The molecular weight of $\text{KOH}$=$\left(39.098+15.999+1.008\right)\text{u}$

= $56.105\text{u}$

Hence, the molecular weight of KOH is $56.105\text{\hspace{0.17em}u}$.