A ballon inflated with helium gas will rise to the ceiling, Ask an Expert

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A ballon inflated with helium gas will rise to the ceiling of aroom. however, after, a certain period of time, the balloon will descend to the floor. Why does the balloon eventually descend?

In the diffusion of HCl and NH3, does the first appearance of white smoke indicate the first contact of the NH3 and HCl molecules? If the answer is no, how will it affect the calculated value of the molecular weight of HCl when using GRAHAM's LAW?

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Category:- Chemistry
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