CAIE IGCSE Chemistry 1.2.2 Effect of Relative Molecular Mass on Questions

Compare gas diffusion rates in CAIE IGCSE Chemistry using relative molecular mass at the same temperature, explaining equal rates and the ammonia-HCl reaction ring.

Exam points

Calculate relative molecular masses before ranking gases from slowest to fastest diffusion at the same temperature.
Identify gases with equal relative molecular masses that diffuse at the same rate under the same conditions.
Explain a rate difference by linking lower relative molecular mass to faster molecular movement.
Explain why the ammonia-HCl reaction ring forms nearer the HCl end, using the two gases' molecular masses and speeds.

[Maximum number: 1]

Which gas has the slowest rate of diffusion?

$\mathrm{H}_{2}$

$\mathrm{NH}_{3}$

$\mathrm{CH}_{4}$

$\mathrm{CO}_{2}$

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CAIE IGCSE Chemistry 1.2.2 Effect of Relative Molecular Mass on Questions question 1