1) NH3M(NH3) = 7 x M(He) = 7 x 4g/mol = 28g/mol
2) N2M(N2) = 7 x M(He) = 7 x 4g/mol = 28g/mol
3) COM(CO) = 7 x M(He) = 7 x 4g/mol = 28g/mol
4) CO2M(CO2) = 7 x M(He) = 7 x 4g/mol = 28g/mol
1) NH3
M(NH3) = 7 x M(He) = 7 x 4g/mol = 28g/mol
2) N2
M(N2) = 7 x M(He) = 7 x 4g/mol = 28g/mol
3) CO
M(CO) = 7 x M(He) = 7 x 4g/mol = 28g/mol
4) CO2
M(CO2) = 7 x M(He) = 7 x 4g/mol = 28g/mol