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The reaction between dinitrogen monoxide, ${N}_{2}O$, and oxygen gas, ${O}_{2}$, carried out at high pressures results in the formation of dinitrogen tetroxide, ${N}_{2}{O}_{4}$, as the only product. The unbalanced equation for the reaction is:

$${ \_ \_ N }_{ 2 }O(g)+{ \_ \_ \_ O }_{ 2 }(g)\rightarrow { \_ \_ \_ { N }_{ 2 }{ O }_{ 4 } }(g)$$

Given the legend:

...and the ${N}_{2}O$/${O}_{2}$ mixture shown below:

Which of the following diagrams represents the composition of the system after the reaction has gone to completion?

A
B
C
D
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