Calculate the molecular mass of the following:

Hydrogen, ${\text{H}}_2$

Calculate the molecular mass of the following :

Oxygen, ${\mathrm{O}}_2$

Calculate the molecular mass of the following:

Chlorine, ${\text{Cl}}_2$

Calculate the molecular mass of the following:

Ammonia,${\text{NH}}_3$

Calculate the molecular mass of the following:

Carbon dioxide, ${\text{CO}}_2$

Calculate the molecular mass of the following compounds:

Methane, ${\mathrm{CH}}_4$

Calculate the molecular mass of the following compound:

Ethane, ${\mathrm{C}}_2{\mathrm{H}}_6$

Calculate the molecular mass of the following compound:

Ethene, ${\text{C}}_2{\mathrm{H}}_4$

Calculate the molecular mass of the following compound:

Ethyne, ${\mathrm{C}}_2{\mathrm{H}}_2$