Elemental analysis of the unknown gas from Part A revealed that it is 30.45% N and 69.55% O by mass. What is the molecular formula for this gas?

Express your answer as a chemical formula.

The rate of effusion of a gas, *r*, is inversely proportional to the square root of its molar mass, *M*. The relative rate of two different gases is expressed as

$\frac{{\mathbf{r}}_{\mathbf{1}}}{{\mathbf{r}}_{\mathbf{2}}}\mathbf{=}\sqrt{\frac{{\mathbf{M}}_{\mathbf{2}}}{{\mathbf{M}}_{\mathbf{1}}}}$

where *r*_{1} and *r*_{2} are the effusion rates of two gases and *M*_{1} and *M _{2}* are their respective molar masses.

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