state the rules governing the number of significant figures that result from each of the following operations addition and subtr
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Answer: The decreasing order of rate of effusion will be :
Explanation: Rate of effusion is defined as the volume of gas which is effused in a given time. This is very well explained by Graham's Law.
This law states that the rate of effusion of gas is inversely proportional to the square root of the molar mass of the gas. More is the molar mass of the gas, its rate of effusion will be slow.
Mathematically,
Molar masses of the given gases are:
1)
2) Ar = 40g/mol
3) He = 4 g/mol
So, the gases which have the highest molecular mass will have the lowest rate of effusion.
Hence, the decreasing order of rate of effusion will be: