Note: I assume you meant "C{l_2}" , not "C12" .
From the kinetic theory we know that effusion rate of component "i" is proportional to it's molar mass (it's known as Graham's Law)
"{Q_i} \\sim \\frac{1}{{\\sqrt {{M_i}} }}" Thus
"\\frac{{{Q_{C{l_2}}}}}{{{Q_{{F_2}}}}} = \\sqrt {\\frac{{{M_{{F_2}}}}}{{{M_{C{l_2}}}}}} = \\sqrt {\\frac{{{M_F}}}{{{M_{Cl}}}}} = \\sqrt {\\frac{{18.998[\\frac{{\\text{g}}}{{{\\text{mol}}}}]}}{{35.446[\\frac{{\\text{g}}}{{{\\text{mol}}}}]}}} \\approx 0.732"
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