Question

Write the names of the following compounds and deduce their molecular masses.

Na₂ SO₄ , K₂ CO₃ , CO₂ , MgCl₂ , NaOH, AlPO₄ , NaHCO₃

Answer 1

a. Na₂SO₄ - Sodium sulphate
Molecular mass= sum of masses of individual components
2 (23) + 32 + 4 (16)= 142g

b. K₂CO₃ - Potassium carbonate
2 (39) + 12 + 3 (16) = 138g

c. CO₂ - Carbon dioxide
12 + 2 (16) = 44g

d. MgCl₂ - Magnesium chloride
24 + 2 (35.5) = 95g

e. NaOH - Sodium hydroxide
23 + 16 + 1 = 40g

f. AlPO₄ - Aluminium phosphate
27 + 31 + 4 (16) = 122g

g. NaHCO₃ - Sodium bicarbonate
23 + 1 + 12 + 3 (16) = 84g