What is the ratio by mass of N and H in `NH_3`

What is the ratio by mass of H and O in water ?

What is the ratio by mass of Mg and S in magnesium sulphate ?

What is the ratio by mass of C and O in carbon dioxide ?

What is the molar mass of C6H5NH2 .

What is the molecular mass of HNO_3 . ( Atomic masses, H=1u,N=14u,0=16u)

What is the charge to mass ratio of electron ?

What is the oxidation number of central atom [Pt Cl_2 (C_5H_5N) (NH_3)]

A mixture of NH_4 NO_3 and (NH_4)_2 HPO_4 contain 30.40% mass per centof nitrogen. What is the mass ratio of the two components in the mixture ?

What is the oxidation number of central atom [Cu Br_2 (H_2O) (NH_3) ]

What is the oxidation number of central atom [Cu Br_2 (H_2O) (NH_3) ]