Question

24. Calculate the molar mass of (a) water (H20) (b) nitric acid (HNO3).with full steps.​

Answer 1

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Answer 2

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(a)

Molar mass of water H20

we know that,

One mole of H2O is made up of 2 moles of hydrogen atoms and 1 mole of oxygen atom.

so,

Mass of 1 mole of Hydrogen atoms = 1 g /mol

Mass of 1mole of Oxygen atoms = 16 g/mol

Mass of two moles of Hydrogen atoms = 2x 1 g/mol = 2 g/mol.

Mass of one mole of Oxygen atoms = 1 x 16 g /mol

On adding all the above-obtained values

we get,

Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.

$\bold{Molar \: mass \: of \:h2o \: = \: 18g/mol}$

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(B) Nitric acid (HNO3)

The molar mass of the chemical substance is equal to the sum of the atomic mass of the individual atoms.

so,

Atomic mass of H = 1u

Atomic mass of N = 14 u

Atomic mass of O = 16u

The molar mass of HNO3 is

(1 × 1) +(1 × 14) + (16×3) = 63 u.

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