What do you understand by the empirical and molecular formula of a compound? How are they related? An organic compound contains $\mathrm{C}= 85.71\%$ and $\mathrm{H}=14.28\%$. Its vapour density is $29$. Find out the empirical and molecular formula of the compound.

Note:- In the book, the percentage of $\mathrm{C}$ and $\mathrm{H}$ given are incorrect.

What do you understand by empirical and molecular formula of a compound? How are they related? A compound contains carbon, hydrogen, and nitrogen in the ratio $18:2:7$. Calculate its empirical formula. If the molecular mass of the compound is $108$, what is its molecular formula?

What is the molecular mass of hydrochloric acid? (At mass of $\mathrm{Cl}=35.5$)

What is the molecular mass of sodium hydroxide? (At mass of $\mathrm{Na}=23, \mathrm{O}=16$)

What is the molecular mass of sodium carbonate? (At mass of $\mathrm{Na}=23, \mathrm{C}=12, \mathrm{O}=16$)

What is the molecular mass of ${\mathrm{BaCl}}_2.2{\mathrm{H}}_2\mathrm{O}$? (At mass of $\mathrm{Cl}=35.5, \mathrm{O}=16, \mathrm{Ba}=137$)

What is the molecular mass of barium sulphate? (At mass of $\mathrm{O}=16, \mathrm{Ba}=137, \mathrm{S}=32$)

What is the molecular mass of aluminium oxide? (At mass of $\mathrm{Al}=27, \mathrm{O}=16$)