Calculate the relative density of hydrogen gases with the following formulas; He, Ne, CH4, NH3, N2, CO, SiH4, SO2

M (H2) = Mr (H2) = Ar (H) * N (H) = 1 * 2 = 2 g / mol;

M (He) = Ar (He) = 4 g / mol;
D H2 (He) = M (He) / M (H2) = 4/2 = 2;

M (Ne) = Ar (Ne) = 20 g / mol;
D H2 (Ne) = M (Ne) / M (H2) = 20/2 = 10;

M (CH4) = Mr (CH4) = Ar (C) * N (C) + Ar (H) * N (H) = 12 * 1 + 1 * 4 = 16 g / mol;
D H2 (CH4) = M (CH4) / M (H2) = 16/2 = 8;

M (NH3) = Mr (NH3) = Ar (N) * N (N) + Ar (H) * N (H) = 14 * 1 + 1 * 3 = 17 g / mol;
D H2 (NH3) = M (NH3) / M (H2) = 17/2 = 8.5;

M (N2) = Mr (N2) = Ar (N) * N (N) = 14 * 2 = 28 g / mol;
D H2 (N2) = M (N2) / M (H2) = 28/2 = 14;

M (CO) = Mr (CO) = Ar (C) * N (C) + Ar (O) * N (O) = 12 * 1 + 16 * 1 = 28 g / mol;
D H2 (CO) = M (CO) / M (H2) = 28/2 = 14;

M (SiH4) = Mr (SiH4) = Ar (Si) * N (Si) + Ar (H) * N (H) = 28 * 1 + 1 * 4 = 32 g / mol;
D H2 (SiH4) = M (SiH4) / M (H2) = 32/2 = 16;

M (SO2) = Mr (SO2) = Ar (S) * N (S) + Ar (O) * N (O) = 32 * 1 + 16 * 2 = 64 g / mol;
D H2 (SO2) = M (SO2) / M (H2) = 64/2 = 32.