Question

Calculate the molar mass of Nitric acid $\left( {HN{O_3}} \right).$ $\left( {{\text{Atomic mass of }}H = 1u,N = 14u,O = 16u} \right)$

Answer 1

Hint- It is a basic mole concept question of physical chemistry .Before calculating the molar mass of given nitric acid we will first understand the term mole and molar mass and then we will use the formula of molar mass.

Complete step by step solution:
A mole is a measuring unit that helps us to compare particles of any given substance and their mass. If we already know the number of moles that are needed, we can use the molar mass concept to calculate how many grams of the substance are required.
The molar mass, also known as molecular weight, is the sum of the total mass of all the atoms that make up a mole of a particular molecule, in grams. The SI unit is grams per mole.
Given
Atomic mass of
$
  H = 1u \\
  N = 14u \\
  O = 16u \\
$
The molar mass of $HN{O_3}$ is
$
   = \left( {1 \times 1} \right) + \left( {1 \times 14} \right) + \left( {16 \times 3} \right) \\
   = 63u \\ $

Hence, the molar mass of nitric acid is $63u$

Additional Information- The concentrations expressed in molality are used for the study of the properties of vapor pressure and temperature changes related solutions and molality is used, as its value does not change with temperature changes. In contrast, the volume of a solution is slightly temperature-dependent.

Note- The molar mass of a compound is calculated summing up the atomic masses to its constituent atoms in g per mole. By expressing the quantity in molar mass it becomes convenient to compare equal numbers of atoms or molecules. For example- when the molar volume of one substance is greater than the other, then it can be assumed that the molecule of the first substance is greater than the other.