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If 9 moles of O2 and 14 moles of N2 are ...

If 9 moles of `O_2` and 14 moles of `N_2` are placed in a container and allowed to react according to the equation
`3O_2 + 2N_2 rarr 2N_2O_3`
The reaction proceeds until 3 moles of `O_2` remain. How many moles of `N_2O_3` are present at that instant.

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