Question

4 NH3 (g) + 5 O2 (g) = 4 NO (g) + 6 H2O (g)
A sample of NH3 is added to an initially evacuated 2.00 L flask at 125 C, until the pressure if 415 torr. O2 is then added to the flask until the total initial pressure ( before reaction) is 875 torr. Assuming the reaction goes to completion, find the partial pressure of all gases in the mixture, after the reaction is complete.

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