Calculate the mass of one atom of silver.

(Atomic masses: $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)

Calculate the mass of one molecule of oxygen.

(Atomic masses: $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)

Calculate the mass of one molecule of water.

(Atomic masses : $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)

Calculate the mass of one molecule of benzene $\left({\mathrm{C}}_6{\mathrm{H}}_6\right)$. 

(Atomic masses : $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)

Calculate the mass of carbon dioxide which contains the same number of molecules as are contained in $40.0\mathrm{g}$ oxygen.

Calculate the number of oxygen atoms present in $88\mathrm{g}$ of ${\mathrm{CO}}_2$. What will be the mass of $\mathrm{CO}$ having the some number of oxygen atoms?

What will be the mass of ${\mathrm{Na}}_2{\mathrm{CO}}_3$ which contains the same number of molecules as contained in $12.3\mathrm{g}$ of ${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$?

(Atomic masses $\mathrm{Na}=23.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{Mg}=24.0\mathrm{u}, \mathrm{S}=32.0\mathrm{u}$)

Calculate the number of atoms of each kind present in $3.42\mathrm{g}$ of cane sugar $\left({\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right)$.

How many atoms and molecules are present in $124\mathrm{g}$ of phosphorus $\left({\mathrm{P}}_4\right)$?

(Atomic mass of $\mathrm{P}=31.0\mathrm{u}$)