Question

The density of Helium will be minimum at
2 atm, 0°C
1 atm, 373°C
2 atm, 273°C
STP

Answer 1

Answer:

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Answer 2

1 atm, 373°C is the correct answer.

• As per ideal gas law, PV = nRT. Number of moles is written as weight (w)/ molecular weight (MW). Writing number of moles in the equation, PV = wRT/MW. Further, density is written as mass/volume. Adding this in new equation, d = PM/RT.

• Now as per this equation, the density is directly proportional to pressure and inversely proportional to temperature. Thus, density will be lowest at high temperature and low pressure.