The empirical formula of an organic compound is ${\bf{C}}{{\bf{H}}_{\bf{2}}}{\bf{O}}$ , its vapour density is 45, The molecular formula of the compound is

A hydrocarbon contains 80% carbon (atomic mass=12u) and 20% hydrogen(atomic mass=1u) by mass. Calculate its empirical formula.

Which of the following pairs has the same empirical formula?

A compound has the molecular formula C$_2$H$_4$O$_2$. What is its empirical formula?

A compound X contains 32% of A, 20% of B, and the remaining percentage of C. The empirical formula of X is: (Given atomic masses of A = 64 u; B = 40 u; C = 32 u)

An organic compound having molecular mass 60 is found to contain C=20%, H=6.67% and N=46.67% while rest is oxygen. On heating it gives ${\rm{N}}{{\rm{H}}_3}$ along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound is

A compound has an empirical formula of CH and a molecular mass of 78 g/mol. What is its molecular formula?

An oxide of metal M contains 70% of the metal (atomic mass = 56u) and 30% oxygen (atomic mass = 16u). Determine the empirical formula of the metal oxide.

A nitrogen oxide contains 30.43% nitrogen by mass. Which of the following could be its molecular formula?

A hydrocarbon contains 82.76% carbon by mass. If 0.90 g of the hydrocarbon occupies a volume of 390 $cm^3$ at STP, what is its molecular formula?

A hydrocarbon contains 82% carbon by weight. If the atomic weight of carbon is 12 and hydrogen is 1, what is its empirical formula?