Calculate the formula masses of following compounds :
(i) Sodium oxide, `Na_(2)O`
(ii) Aluminium oxide, `Al_(2)O_(3)`
(Given : Atomic masses : `Na = 23 u , O = 16 u , Al = 27 u`)

Aluminium oxide, Al_(2)O_(3) is

(a) Define 'formula unit' of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride ? (b) Calculate the formula masses of the following compounds : (i) Calcium chloride , (ii) Sodium carbonate (Given : Atomic masses : Ca = 40 u , Cl = 35.5 u , Na = 23 u , C = 12 u , O = 16 u )

Calculate the formula mass of sodium carbonate (Na_(2)CO_(3)) . (Given : Atomic masses : Na = 23 u, C = 12 u, O= 16 u )

Calculate the molecular masses of the following: (i) C_(12)H_(22)O_(11) , (ii) Al_(2)(SO_(4))_(3) Given atomic masses : C = 12.0 u, H= 1.0 u, O = 16.0 u, Al = 27.0 u, S = 32.0 u

Formula unit mass of K_(2) CO_(3) is (Atomic mass of K = 39 u , C = 12 u and O = 16 u)

Formula unit mass of K_(2) CO_(3) is (Atomic mass of K = 39 u , C = 12 u and O = 16 u)

Calculate the formula mass of potassium carbonate (K_(2)CO_(3)) (Given : Atomic masses : K = 39u , C = 12 u , O = 16 u )

What is the mass of 5 moles of sodium carbonate (Na_(2)CO_(3)) ? (Atomic masses : Na = 32 u , C = 12 u , O = 16 u )

The valency of aluminium in aluminium oxide (Al_2O_3) is

Calculate the molecular mass of sulphuric acid (H_(2)SO_(4)) . (Given : Atomic masses : H = 1 , S = 32 u , O = 16 u ).