Wait until a while ring of solid ammonium chloride forms where the hydrogen chloride and ammonia gases meet. The ammonia gas, having a lower molecular weight than the hydrogen chloride, will diffuse ...

CCTV footage showed a hydrogen chloride gas cloud engulfing the atmosphere within 60 seconds and nearby schools were forced to close. | ITV News Meridian ...

When writing chemical equations for reversible reactions ... can break down to form ammonia and hydrogen chloride. It also shows that ammonia and hydrogen chloride (colourless gases) can react ...