At 298 K, which gas has the greater root-mean-square speed, Cl₂(g) or I₂(g)? Briefly…

CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance

Problem

At 298 K, which gas has the greater root-mean-square speed, Cl₂(g) or I₂(g)? Briefly explain your choice in one or two sentences. (Molar masses: Cl₂ = 70.90 g mol⁻¹, I₂ = 253.8 g mol⁻¹.)

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