Question

gas cylinder hold 85 grams of gas x. the same cylinder when filled with hydrogen holds 8.5 grams of hydrogen under the same conditions of temperature and pressure. calculate the molecular weight of X

Answer 1

At same temperature and pressure,

Vapour density of the gas X =  mass of gas X/ mass of hydrogen gas

  = 85/5

  =17

Now, molecular weight of gas X = vapour density x 2

  = 17 x 2

  = 34 g

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Answer 2

Answer:

Explanation:

Since the cylinder has same conditions of temperature and pressure for both the gases X and Hydrogen so, from the ideal gas equation we can infer that,

n1=n2

Where, n1=number of moles of gas X = mass in system/Molecular Mass

= 85/Molecular Mass

n2=number of moles of hydrogen = mass in system/Molecular Mass = 8.5 / 2

Molecular Mass = (85 x 2) / 8.5

Molecular Mass of gas X = 20 g/mol