Calculate the molecular mass of carbon dioxide, ${\mathrm{CO}}_2$.

Calculate the molecular mass of methane, ${\mathrm{CH}}_4$.

Calculate the molecular mass of ethane, ${\mathrm{C}}_2{\mathrm{H}}_6$.

Calculate the molecular mass of ethene, ${\mathrm{C}}_2{\mathrm{H}}_4$.

Calculate the molecular mass of ethyne, ${\mathrm{C}}_2{\mathrm{H}}_2$.

Calculate the molecular mass of propene, ${\mathrm{C}}_3{\mathrm{H}}_6$.

Calculate the molecular mass of potassium permanganate $\left({\mathrm{KMnO}}_4\right)$. (Atomic masses: $\mathrm{K}=39.0 \mathrm{u}, \mathrm{Mn}=55.0 \mathrm{u}$)

Calculate the molecular mass of potassium dichromate $\left({\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right)$. (Atomic masses $\mathrm{K}=39 \mathrm{u}, \mathrm{Cr}=52 \mathrm{u}$)

Calculate the molecular mass of potassium ferrocyanide, ${\mathrm{K}}_4\left[\mathrm{Fe}\right(\mathrm{CN}{)}_6]$

(Atomic masses :$\mathrm{K}=39.0 \mathrm{u}, \mathrm{Fe}=56.0 \mathrm{u}, \mathrm{N}=14.0 \mathrm{u}$)