A compound contains `K=42.3913%, Fe=15.2173%, C=19.5652%, N=22.8260%`. Find the empirical formula of the compound.

A substance used as a water softener has the following mass percentage composition : 42.07% Na, 18.9% P , and 39.04% of oxygen. Determine the empirical formula of the compound. (Na = 23, P = 31, 0 = 16)

An orgainc compound contains 43.98% C , 2.09% H , and 37.2% Cl . Calculate its empirical formula.

Carbon combines with hydrogen to forom three compounds A, B and C . The percentage of hydrogen in A, B and C .is 25, 14.3, and 7.7, respectively. (a) Find the empirical formula of the compounds. (b) Which law of chemical combination does this example illustrate? How?

A compound on analysis gave the following percentage composition: Na=14.31% S = 9.97%, H = 6.22%, O = 69.5%, calcualte the molecular formula of the compound on the assumption that all the hydrogen in the compound is present in combination with oxygen as water of crystallisation. Molecular mass of the compound is 322 [Na = 23, S = 32, H = 1, 0 = 16].

The molecular mass of an organic compound is 78 amu is known to contain 92.31% of carbon and 7.69% of hydrogen. Determine the ermpricial and molecular formula of the compound.

An organometallic compound on analysis was found to contain, C = 64.4%, H= 5.5% and Fe = 29.9%. Determine its empricial formula. (At. Mass of Fe = 56 u).