An organic compound with $C = 40\%$ and $H = 6.7\%$ will have the empirical formula

$A$ compound $(60 \ g)$ on analysis gave $C = 24 \ g$,$H = 4 \ g$,$O = 32 \ g$. Its empirical formula is

$A$ carbon compound contains $12.8 \%$ of carbon,$2.1 \%$ of hydrogen and $85.1 \%$ of bromine. The molecular weight of the compound is $187.9$. Calculate the molecular formula of the compound. (Atomic weight: $H=1.008, C=12.0, Br=79.9$)

$A$ sample of a pure compound contains $1.15 \ g$ of sodium,$3.01 \times 10^{22}$ atoms of carbon,and $0.1 \ mol$ of oxygen atoms. Its empirical formula is:

An organic compound on analysis gives the following composition: $C = 54.5\%, O = 36.4\%, H = 9.1\%$. The empirical formula of the compound is ..

If two compounds have the same empirical formula but different molecular formulas,which of the following do they possess?