Chemistry
Find the relative molecular mass of a gas, 0.546 g of which occupies 360 cm3 at 87°C and 380 mm Hg pressure. (1 litre of hydrogen at s.t.p. weighs 0.09 g)
Stoichiometry
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Answer
Given,
| Initial Conditions | Final Conditions (s.t.p.) |
|---|---|
| P1 = 380 mm of Hg | P2 = 760 mm of Hg |
| V1 = 360 cm3 | V2 = x |
| T1 = 87 + 273 K = 360 K | T2 = 273 K |
Using the gas equation,
Substituting the values we get,
At s.t.p. 0.1365 lit weighs 0.546 g
Therefore, 1 lit of gas weighs = x 1 = 4 g
Vapour density of gas =
Molecular weight = 2 x Vapour density
= 2 x 44.444 = 88.888 = 88.89 g
Hence, relative molecular mass of gas 88.89 g
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