Calculate the mass precent of different elements present in sodium sulphate `(Na_(2)SO_(4))`....

(i) Calculate the mass percentage of various elements present in magnesium sulphate, MgSO_(4) (ii) Calculate the percentage of cation in ammonium dichromate.

(a) Define mole. What are the two things that a mole represents. (b) What weight of each element is present in 1.5 moles of sodium sulphate , Na_(2)SO_(3) ? (Atomic masses : Na = 23 u , C = 12 u , O = 16 u )

Calculate the mass of the carbon present in 0.1 mole of sodium ferricyanide Na_(3) [Fe(CN)_(6)] .

How many valence electrons are present in sulphate ion, SO_(4)^(-2)

Calculate the mass of oxygen in grams present in 0.1 mole of Na_(2)CO_(3).10H_(2)O

Calculate the number of moles of sodium (Na) atoms present in 11.5 g of sodium.

Calculate the number of H atoms in 39.6g of ammonium sulphate, (NH_(4))_(2) SO_(4) .