Four speed-distribution curves (I–IV) are obtained for samples of helium gas (atomic…

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

Four speed-distribution curves (I–IV) are obtained for samples of helium gas (atomic mass ≈ 4 u) and argon gas (atomic mass ≈ 40 u) at 300 K and 600 K. Observed characteristics are as follows: • Curve I: narrow peak at about 400 m/s • Curve II: broad peak at about 570 m/s • Curve III: narrow peak at about 1 300 m/s • Curve IV: broad peak at about 1 840 m/s Each curve corresponds to one of the four cases (He 300 K, He 600 K, Ar 300 K, Ar 600 K). Which assignment is most consistent with the observations? (a) I: He 300 K; II: He 600 K; III: Ar 300 K; IV: Ar 600 K\text{I: He }300\,\text{K};\,\text{II: He }600\,\text{K};\,\text{III: Ar }300\,\text{K};\,\text{IV: Ar }600\,\text{K} (b) I: Ar 300 K; II: Ar 600 K; III: He 300 K; IV: He 600 K\text{I: Ar }300\,\text{K};\,\text{II: Ar }600\,\text{K};\,\text{III: He }300\,\text{K};\,\text{IV: He }600\,\text{K} (c) I: Ar 600 K; II: Ar 300 K; III: He 300 K; IV: He 600 K\text{I: Ar }600\,\text{K};\,\text{II: Ar }300\,\text{K};\,\text{III: He }300\,\text{K};\,\text{IV: He }600\,\text{K} (d) I: Ar 300 K; II: Ar 600 K; III: He 600 K; IV: He 300 K\text{I: Ar }300\,\text{K};\,\text{II: Ar }600\,\text{K};\,\text{III: He }600\,\text{K};\,\text{IV: He }300\,\text{K}

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