During the volcanic eruption of Mt.Pelee in 1902,an incredibly hot "burning cloud" rolled down the mountain and incinerated the town of Saint-Pierre.From the damage done,the temperature in the cloud was estimated at 700 C.If the air temperature was 20 C and a mole of air is 29 grams,estimate the molecular weight of the gas in the "burning cloud" that made it heavier than the surrounding air.(As a follow-on,estimate the most probable composition of the cloud.Some typical volcanic gases are H2S,SO2,H2SO4,CO2,NO. )
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