Question

Calculate the molar mass of oxalic acid (C = 12, O = 16, H = 1)

Answer 1

Hint: The molar mass of any compound is the sum of the masses of all the atoms present in that compound in their respective quantities. The molecular weight has a unit of grams per mole. Oxalic acid is a type of organic compound having 2 carboxylic acids as a functional group and has the formula $HOOCCOOH$.

Complete answer:
Molar mass of any molecule is the sum of the masses of the individual atoms present in that molecule in the quantities in which it is present. We have been given to find the molar mass of oxalic acid. Oxalic acid is a type of organic molecule consisting of carbon, hydrogen and oxygen. The molecular formula for oxalic acid is ${{C}_{2}}{{H}_{2}}{{O}_{4}}$.
As we have the molecular formula of oxalic acid as ${{C}_{2}}{{H}_{2}}{{O}_{4}}$. The atomic mass of oxalic acid will be the sum of atomic mass of 2 carbon atoms, 2 hydrogen atoms, and 4 oxygen atoms. The atomic masses are given as carbon (C) = 12 g/mol, Hydrogen (H) = 1 g/mol, and oxygen (O) = 16 g/mol.
Now, the molar mass of oxalic acid will be = 2 (C) + 2 (H) + 4 (O) g/mol
Molar mass of oxalic acid = 2 (12) + 2 (1) + 4 (16) g/mol
Molar mass of oxalic acid = 24 + 2 + 64 g/mol
Molar mass of oxalic acid = 90 g/mol
Hence, the molar mass of oxalic acid is 90 grams per mole.

Note:
The weight of any element or compound in 1 mole that is $6.022\times {{10}^{23}}$ particles of that molecule is its atomic or molar mass. So it is measured in g/mol. Thus, 1 mole of oxalic acid has molar mass 90 g/mol. Also the molar mass is expressed in atomic mass units that express the mass in 1 mole and denoted as ‘amu’ or ‘u’.