At \( 0^{\circ} \mathrm{C} \) the density of a certain oxide of a g...

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At \( 0^{\circ} \mathrm{C} \) the density of a certain oxide of a gas at 2 bar
\( \mathrm{P} \) is same as that of dinitrogen at 5 bar. What is the

W molecular mass of the oxide at \( 0^{\circ} \mathrm{C} \) ?
(1) \( 70 \mathrm{~g} / \mathrm{mol} \)
(2) \( 60 \mathrm{~g} / \mathrm{mol} \)
(3) \( 80 \mathrm{~g} / \mathrm{mol} \)
(4) \( 50 \mathrm{~g} / \mathrm{mol} \)
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