Question

Find the molecular masses of the following compounds:

Sulphuric Acid (H₂SO₄), PotassiumNitrate (KNO₃)

Hydrogen Sulphide (H₂S) Carbon Dioxide (CO₂)

(Atomic Masses: H = I, S = 32, C = 12, O = 16, K = 40, N = 14)

Answer 1

Molecular mass of Sulphuric acid:

Molecular mass of sulphuric acid = (2 × Mass of hydrogen) + Mass of sulphur + (4 × Mass of oxygen)

= (2 × 1) + 32 + (4 × 16) = 98 amu

Molecular mass of Potassium nitrate:

Molecular mass of Potassium nitrate = Mass of potassium + Mass of nitrogen + (3 × Mass of oxygen)

= 40 + 14 + (3 × 16) = 102 amu

Molecular mass of Hydrogen sulphide:

Molecular mass of Hydrogen sulphide = (2 × Mass of hydrogen) + Mass of sulphur

= (2 × 1) + 32 = 34 amu

Molecular mass of Carbon dioxide:

Molecular mass of Carbon dioxide = Mass of carbon + (2 × Mass of oxygen)

= 12 + (2 × 16) = 44 amu