Calculate the mass percentage of different elements present in sodium sulphate `(Na_2SO_4)`

Elements present in 4 ^ (th) row are

Calculate the mass percentage composition of the elements in nitric acid (H=1 ,N=14, O=16) .

Calculate the total number of electrons present in 1.4g of dinitrogen gas.

Oxidation number of arsenic in sodium arsenate (Na_3AsO_4) is :

The mass percentage of each consituent element paresent in 100 g of a compound is called its _____________.

Calculate 2% of Rs. 8000.

Work out the percentage composition of constituents elements in the following compounds: Macrocosmic salt - Sodium ammonium hydrogen phosphate tetrahydrate (NaNh_4HPO_4*4H_2O) (At. ,ass : Pb = 207, P = 31, O = 16, K = 39, Cr =52, Na =23, N=14)

Work out the percentage composition of constituents elements in the following compounds: Lead phosphate [Pb_3(PO_4)_2]

Work out the percentage composition of constituents elements in the following compounds: Potassium dichromate (K_2Cr_2O_7)