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

Number of hydrogen atoms per molecule of a hydrocarbon $A$ having $85.8 \%$ carbon is $...............$. (Given : Molar mass of $A = 84 \ g \ mol^{-1}$ )

An organic compound has an empirical formula $CH_2O$,its vapour density is $45$. The molecular formula of the compound is

Number of $g$ of oxygen in $32.2\,g$ of $Na_2SO_4 \cdot 10H_2O$ is

An organic compound contains $A$ and $B$ in a mass ratio of $50:50$. If their atomic masses are $10$ and $40$ respectively,then its empirical formula will be ....................

In a substance,the number of atoms of $Cr$ and $O$ are $4.8 \times 10^{10}$ and $9.6 \times 10^{10}$ respectively. The empirical formula of the substance is .......