Relative masses

1

What is the relative atomic masses, Ar of the following:

2

What is the relative molecular masses, Mr of the following:

3

What is the relative formula masses, Mr of the following:

  a N     a HCl     a NaCl  
  b Si     b CO2     b MgF2  
  c Cu     c NH3     c CaCO3  
          d H2SO4     d Al2(CO3)3  
          e HNO3     e (NH4)2SO4