Determine the formula of the organic compound if it's molecule contains 12 atoms of carbon. The percentage compositions of hydrogen and oxygen are 6.48 and 51.42 respectively.

A compound with empirical formula AB₂, has the vapour density equal to it's empirical formula weight. Find it's molecular formula.

10.47 g of a compound contains 6.25 g of metal A and rest non-metal B. Calculate the empirical formula of the compound (At. wt of A = 207, B = 35.5)

A hydride of nitrogen contains 87.5% percent by mass of nitrogen. Determine the empirical formula of this compound.