Chemistry

Problem

Three ideal gases—helium (4 g/mol), oxygen (32 g/mol), and carbon dioxide (44 g/mol)—are each contained in separate, identical vessels at the same temperature. Which ordering lists their rms speeds from greatest to least? a)

v_{\text{rms}}(\text{He}) > v_{\text{rms}}(\text{CO}_2) > v_{\text{rms}}(\text{O}_2)

v_{\text{rms}}(\text{CO}_2) > v_{\text{rms}}(\text{O}_2) > v_{\text{rms}}(\text{He})

v_{\text{rms}}(\text{He}) > v_{\text{rms}}(\text{O}_2) > v_{\text{rms}}(\text{CO}_2)

v_{\text{rms}}(\text{He}) = v_{\text{rms}}(\text{O}_2) = v_{\text{rms}}(\text{CO}_2)

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