Chemistry - Mole Concept Question with Solution | TestHub
ChemistryMole ConceptLaws of Chemical CalculationsMedium2 minQB
ChemistryMediumnumerical
When a solid element is reacted with chlorine, a gaseous chloride of vapour density 68.75 is formed. If this reaction is performed at constant temperature and pressure, the volume of the system reduces by one third. If the equivalent weight of the solid element is E, then the value of (12/31× E) is
Answer:
4.00
Solution:
Molar mass of chloride = 2 × 68.75 = 137.5. Let it be MClₓ: per mole, x/2 mol Cl₂ gas give 1 mol gaseous chloride. Volume falls by one third, so final = 2/3 of initial: 1 = 2/3·x/2 ⇒ x = 3. Then M = 137.5 - 3(35.5) = 31, so E = 31/3 and 12/31×31/3 = 4. Ans: 4.
Stream:JEESubject:ChemistryTopic:Mole ConceptSubtopic:Laws of Chemical Calculations
⏱ 2mℹ️ Source: QB
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