An organic compound made of $C$,$H$ and $N$ contains $20 \%$ nitrogen. Its molecular weight is:

An organic compound containing carbon and hydrogen has an empirical formula of $CH_2$. The mass of $1 \, L$ of this organic gas is equal to the mass of $1 \, L$ of $N_2$ gas at the same temperature and pressure. What is the molecular formula of the organic gas?

An alkane has a $C/H$ ratio (by mass) of $5.1428$. Its molecular formula is

Define Percentage Composition in a compound.

$A$ hydrocarbon contains $10.5 \, g$ of carbon and $1 \, g$ of hydrogen. If the volume of $2.4 \, g$ of this hydrocarbon is $1 \, L$ at $127 \, ^\circ C$ and $1 \, atm$ pressure,then the hydrocarbon is:

The formula of a substance is $(CO)_x$. If its vapor density is $70$,find the value of $x$.