4.48 dm3 of gas at STP weights 3.4 g. Calculate the molecular weight of the gas?
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molecular mass of any gas weighs 22.4dm^3 at S.T.P
4.48dm^3 of ammonia weighs 3.4g at S.T.P
=>22.4dm^3 of ammonia weighs (22.4X3.4)/4.48
=17g
therefore molecular mass of ammonia is 17g
Answered by
1
Given - Weight of gas at 4.48 dm³
Find - Molecular weight of the gas
Solution - The molecular weight of the gas is 17 grams.
4.48 dm³ of gas weighs 3.4 gram
Thus, 22.4 dm³ of gas will weigh = 3.4*22.4/4.48
22.4 dm³ of gas will weigh = 17 gram
Now, as per the known facts, 1 mole of any gas occupies 22.4 dm³. Also, the molecular weight of gas is the mass of 1 mole of gas.
Thus, the molecular weight of the gas is 17 grams.
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