Explain how 1 vol of nitrogen combines with 3 vol of hydrogen to give 2 vol of ammonia.

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Solution

The reaction is given by:
$N_{2} + H_{2} \to N H_{3}$
If we balance the equation,
$\begin{matrix} 1 N_{2} + & 3 H_{2} & \to & 2 N H_{3} 1 v o l & 3 v o l & 2 v o l \end{matrix}$

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26

d e n s i t y = 0.855

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