How many moles of nitrogen are needed to produce 12 moles of ammonia (NH3)?
N2 + 3H2 → 2NH3
1 mole
3 moles
2 moles
6 moles

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?