Calculate the empirical formula of a mineral which has the following percentage composition :
CuO = 44.82%, SiO_(2) = 34.83% and water = 20.35% (at. wt. of Cu = 63.5, Si = 28).

Write the empirical formulae of the compounds with the following percentage composition : Zn = 47.8% Cl = 52.2%

Determine the empirical formula of a compound with following percentage composition Cu= 47.3, Cl= 52.7.

Calculate the percentage composition of C2H5OH.

A substance on analysis gave the following percentage composition Na = 43.4% C = 11.3% O = 45.3% Calculate the empirical formula.

An inorganic salt gave the following percentage composition : Na= 29.11%, S= 40.51% and O= 30.38%. Calculate the empirical formula of the salt. (At. Mass Na= 23, S=32)

An organic compound has the following percentage composition : C= 48%, H= 8% N= 28% and rest of oxygen. Calculate the empirical formula of the compound.

What is the simplest formula of the compound which has the following percentage composition carbon 80% , hydrogen 20% , if the molecular mass is 30. calculate its molecular formula ?

An organic compound on analysis gave the following percentage composition of C= 57.8, H= 3.6 and the rest is oxygen. Vapour density of the compound is 83. Find out the molecular formula of the compound.

An organic compound on analysis gave the following data : C = 57.82% , H = 3.6% and O = 38.58% . Find its empirical formula.

An inorganic substance on analysis gave the following results Na = 29.1% S = 40.5% and O = 30.4% . Calculate its empirical formula.