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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.
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?
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Based on our data, we think this problem is relevant for Professor All Professors' class at TOURO.