Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simulta
neously. After a certain amount of time, it was found that 8.44 mL of O2 had passed through the membrane, but only 3.95 mL of of the unknown gas had passed through. What is the molar mass of the unknown gas?
1 answer:
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Answer: 3) 39.96 amu
Explanation:
Mass of isotope Ar- 36 = 35.97 amu
% abundance of isotope Ar- 36= 0.337% =
Mass of isotope Ar- 38 = 37.96 amu
% abundance of isotope 2 = 0.063 % =
Mass of isotope Ar- 40 = 39.96 amu
% abundance of isotope 2 = 99.600 % =
Formula used for average atomic mass of an element :
Therefore, the average atomic mass of argon is 39.96 amu