uestion Completion Status: QUESTION 20 1.000 atm of oxygen gas, placed in a cont

Question

uestion Completion Status: QUESTION 20 1.000 atm of oxygen gas, placed in a container having a pinhole opening in its side, leaks from the container 2.14 times faster than does 1.000 atm of an unknown gas placed in this same apparatus. Which of these species could be the unknown gas? (Hint: What are their molar masses?) O Kr (83.80gmol) OUF6 (352.02g/mol) O SF6 (146.06g/mol) O Xe (131.29g/mol) / 2 O Cl2 (70.91gmol) Save Click Save and Submit to save and submit. Click Save All Answers to save all answers

Explanation / Answer

by defintion

rate of effusion or diffusion is inversely proportional to the square root of molar mass

so for two gases 1 and 2

r2/r1 = sqrt ( M1/M2)

given

r1 = rate of oxygen

M1 = molar mass of Oxygen = 32 g/mol

r2 = rate of unknown gas

M2 = molar mass of unknown gas

also given

r1 = 2.14 r2

wo

r2 / 2.14 r2 = sqrt ( 32 / M2)

M2 = 146.5 g/mol

so

the gas should be SF6 ( 146.06 g/mol)

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