$A$ gas is found to have a formula $[CO]_x$. If its vapour density is $70$,the value of $x$ is

$A$ hydrocarbon contains $10.5 \,g$ of carbon and $1 \,g$ of hydrogen. If $2.4 \,g$ of this hydrocarbon occupies a volume of $1 \,L$ at $1 \,atm$ pressure and $127 \,^{\circ}C$ temperature,what is the molecular formula of the hydrocarbon?

Analysis of a $60 \, g$ compound gives $C = 24 \, g$,$H = 4 \, g$,and $O = 32 \, g$. What is its empirical formula?

An organic compound contains $C = 74.0\%$,$H = 8.65\%$ and $N = 17.3\%$. Its empirical formula is:

An organic compound contains $49.3\%$ carbon,$6.84\%$ hydrogen,and the rest is oxygen. Its vapor density is $73$. What is its molecular formula?

What is the mass percentage of carbon in urea (in $\%$)? (molar mass of urea $= 60 \ g \ mol^{-1}$)