Carbon percentage is maximum in

The formula which represents the simplest ratio of atoms of different elements present in a molecule of a substance is called:

Percentage of gold in $14$ carat gold is (in $\%$)

In a compound formed by element $X$ (atomic mass = $75$) and element $Y$ (atomic mass = $16$),if the percentage of $X$ is $75.8\%$,what will be its empirical formula?

The empirical formula of a hydrocarbon containing $80\%$ carbon and $20\%$ hydrogen is:

An organic compound contains $69 \%$ carbon and $4.8 \%$ hydrogen,the remainder being oxygen. Calculate the masses of carbon dioxide and water produced when $0.20 \ g$ of this substance is subjected to complete combustion.