Chemistry Practice Problems Effusion Practice Problems Solution: Arsenic(III) sulfide sublimes readily, even below ...

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Solution: Arsenic(III) sulfide sublimes readily, even below its melting point of 320 oC. The molecules of the vapor phase are found to effuse through a tiny hole at 0.28 times the rate of effusion of Ar atoms under the same conditions of temperature and pressure.What is the molecular formula of arsenic(III) sulfide in the gas phase?

Problem

Arsenic(III) sulfide sublimes readily, even below its melting point of 320 oC. The molecules of the vapor phase are found to effuse through a tiny hole at 0.28 times the rate of effusion of Ar atoms under the same conditions of temperature and pressure.

What is the molecular formula of arsenic(III) sulfide in the gas phase?


Solution

Concept: Graham's Law of Effusion.

We are given 2 different gases, so we need to use the Rate of Effusion equation with 2 gases, to calculate the Molar Mass of Arsenic (III) sulfide in gas phase, and then compare it to the mass of Arsenic (III) sulfide in solid phase. Because remember sublimation is solid → gas phase change.

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