Which one of the following is the heaviest?\

Question

Professor PC Thomas Classes · Answer

(b) : Mass of mercury $=25 \mathrm{~g}$ \Mass of 2 mol of carbon dioxide $\left(\mathrm{CO}_{2}ight)=2 	imes 44=88 \mathrm{~g}$\ Mass of 2 mol of water $\left(\mathrm{H}_{2} \mathrm{O}ight)=2 	imes 18=36 \mathrm{~g}$\ Mass of $3.012 	imes 10^{23}$ molecules of oxygen $\left(\mathrm{O}_{2}ight)$ $$ =\frac{3.102 	imes 10^{23}}{6.022 	imes 10^{23}}=0.5 \mathrm{~mol} $$ Number of moles $=\frac{	ext { Mass }}{32} \Rightarrow 0.5=\frac{	ext { Mass }}{32}$\ $	herefore \quad$ Mass $=16 \mathrm{~g}$\