In an experiment similar to the one you performed in lab, a student mistakenly a

Question

In an experiment similar to the one you performed in lab, a student mistakenly assumed that the temperature of the vapor was ambient. Would the calculated molecular weight therefore be la than the true value? Explain. rger or smalier ring of formula S. If the density of elemental sulfur vapor at 445 C and 807 torris 4.63 g/L, calculate the molar mass of the sulfur gas and hence deduce its molecular formula (ie., determine x) 2. The element sulfur exists naturally as a "network atomic solid" with molecules of sulfur atoms bonded ina

Explanation / Answer

Determination of molecular weight

1. If the student by mistake took the temperature as ambient. The calculated molecular weight would be too low. the ambient temperature was lower and the relation between molecular weight FW to temperature is direct.

grams/FW = PV/RT

with T = temperature

2. Using,

molecular weight of Sx = density x gas constant x temperature/pressure

feeding the given values,             

molecular weight of Sx = 4.63 x 0.08205 x (445 + 273)/(807/760) = 256.88 g/mol

1 atm = 760 torr

273 + 445oC = 718 K

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