Three ideal gases—helium (4 g/mol)

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

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) vrms(He)>vrms(CO2)>vrms(O2)v_{\text{rms}}(\text{He}) > v_{\text{rms}}(\text{CO}_2) > v_{\text{rms}}(\text{O}_2) (b) vrms(CO2)>vrms(O2)>vrms(He)v_{\text{rms}}(\text{CO}_2) > v_{\text{rms}}(\text{O}_2) > v_{\text{rms}}(\text{He}) (c) vrms(He)>vrms(O2)>vrms(CO2)v_{\text{rms}}(\text{He}) > v_{\text{rms}}(\text{O}_2) > v_{\text{rms}}(\text{CO}_2) (d) vrms(He)=vrms(O2)=vrms(CO2)v_{\text{rms}}(\text{He}) = v_{\text{rms}}(\text{O}_2) = v_{\text{rms}}(\text{CO}_2)

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