Question

Molecular mass of ${\mathrm{KNO}}_3$ is?

Answer 1

Molecular mass: Molecular mass is the sum of the masses of the atoms in a molecule.

Given compound: Potassium Nitrate (${\mathrm{KNO}}_3$)

Step 1: Analyzing atomic masses of atoms involved in the compound.

• Atomic mass of$\mathrm{K}=39.0983\mathrm{u}$
• Atomic mass of$\mathrm{N}=14.0067\mathrm{u}$
• Atomic mass of$\mathrm{O}=15.999\mathrm{u}$

Step 2: Determining Molecular mass of the compound.

Molecular mass of ${\mathrm{KNO}}_3$

$(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{K})\mathrm{x}1+(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{N})\mathrm{x}1+(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{O})\mathrm{x}3$

$$\begin{gathered} (39.0983\mathrm{x}1)+(14.0067\mathrm{x}1)+(15.999\mathrm{x}3) \\ =101.1032\mathrm{g}/\mathrm{mol} \end{gathered}$$

Hence, the Molecular mass of ${\mathrm{KNO}}_3$ is $101.1032\mathrm{g}/\mathrm{mol}$