An organic compound containing $C$ and $H$ has $92.3 \%$ of carbon. Its empirical formula is:

$A$ 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:

In each molecule of carbon tetrachloride,the mass percent of carbon and chlorine respectively are

$A$ sample of calcium carbonate $(CaCO_3)$ has the following percentage composition: $Ca = 40\%$; $C = 12\%$; $O = 48\%$. If the law of constant proportions is true,then the weight of calcium in $4 \, g$ of a sample of calcium carbonate obtained from another source will be $... \, g$.

An organic compound with $C = 40\%$ and $H = 6.7\%$ will have the empirical formula

Calculate the percentage composition of element $P$ in ${H_3PO_4}$. (in $\%$)