A 30 cm$^3$ sample of nitrogen was reacted with a 60 cm$^3$ sample of fluorine according to the equation
$\frac{1}{2}$N$_2$(g) + $\frac{3}{2}$F$_2$(g) $\to$ NF$_3$(g)
What is the volume of the gas mixture after the reaction, at constant temperature and pressure?
1 )
20 cm$^3$
2 )
30 cm$^3$
3 )
40 cm$^3$
50 cm$^3$
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