Calculate the Molar Mass of Nitric Acid (HNO3). Atomic Mass of H=1u, N=14u, O=16u

Answer: The molar mass of HNO₃ is 63 u

The sum of the total mass in grams of the atoms present in a molecule per mole is the molar mass/molecular weight. The molar mass unit is grams/mole.

To calculate the molar mass, add the atomic masses of all the chemical’s constituents. You can either memorise it or use the periodic table of elements to discover all of the atomic masses.

When describing atomic masses and molecular masses, another unit of mass commonly used is the Dalton (Da) or unified atomic mass unit (u). It is defined as 1 / 12  of the mass of one carbon-12 atom, and it was previously shortened as “amu.”

Given:

1. mass of H = 1u
2. mass of N = 14 u
3. mass of O = 16u

The following steps involve calculating the molar mass of compound;

• Find the number of individual atoms in compound or molecule.
• Multiply the molar mass of every element.
• Add up all and assign units as grams/mole or “u’.

The molar mass of HNO₃ is

   =  [(1 × 1) +(1 × 14) + (16×3) ]u.

                            = [ 1 + 14 + 48 ] u

                                    = 63 u

Therefore, The molar mass of HNO₃ is 63 u.