Calculate the molar mass of each of the following:

(a) S8

(b) C2H12

(c) Sc2 (SO4) 3

(d) CH3COCH3 (acetone)

(e) C6H12O6 (glucose)

Molar mass

The mass present in one mole of a specific species.

The molar mass of a compound, can easily be calculated as the sum of the all the individual atom multiplied by the number of total atoms.

(a) S₈

Molar mass of of the atoms are -

sulfur, S = 32 g/mol.

Molar mass of S₈ = 8 * 32 g/mol. = 256 g/mol.

(b) C₂H₁₂

Molar mass of of the atoms are -

Hydrogen, H = 1 g/mol

Carbon, C = 12 g/mol

Molar mass of C₂H₁₂ = (2 * 12) + (12 * 1) = 36 g / mol

(c) Sc₂ (SO₄) ₃

Molar mass of of the atoms are -

sulfur, S = 32 g/mol.

oxygen, O = 16 g/mol.

scandium, Sc = 45 g/mol.

Molar mass of Sc₂ (SO₄) ₃ = (2 * 45) + (3 * 32) + (12 * 16) = 378 g / mol

(d) CH₃COCH₃ (acetone)

Molar mass of of the atoms are -

Carbon, C = 12 g/mol

oxygen, O = 16 g/mol.

Hydrogen, H = 1 g/mol

Molar mass of CH₃COCH₃ (acetone) = (3 * 12) + (1 * 16) + (6 * 1) = 58g/mol

(e) C₆H₁₂O₆ (glucose)

Molar mass of of the atoms are -

Carbon, C = 12 g/mol

oxygen, O = 16 g/mol.

Hydrogen, H = 1 g/mol

Molar mass of C₆H₁₂O₆ (glucose) = (6 * 12) + (12 * 1) + (6 * 16) = 108g/mol.