Determine the density of chlorine relative to hydrogen and helium.

For helium:
D (can be denoted 1) = M (Cl2) / M (He2) = 35.5 × 2/2 × 2 = 71/4 = 17.5
About hydrogen:
D (can be denoted 2) = M (Cl2) / M (H2) = 35.5 × 2/1 × 2 = 71/2 = 35.5



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