Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptMiscellaneous/MixedMedium2 minPYQ_2015
ChemistryMediumassertion reason

In the following reaction:

A+2B+3CAB2C3
6.0 g of A, 6.0×1023  atoms of B and 0.036 mol of C reacted and formed 4.8 g of compound AB2C3. If the atomic mass of A  and C are 60 and 80 amu, respectively. What is the atomic mass of B in amu? (Avogadro number=6×1023)

Options:

Answer:
D
Solution:

A + 2 B + 3 C AB 2 C 3 6 g 6 × 1 0 2 3 atoms 0.036 moles Moles 6 6 0 6 × 1 0 2 3 6 × 1 0 2 3 0.1 mole 1.0 mole 0.036 moles

0.11 ,1.02 ,0.0363; the least value is 0.012, i.e., C is the limiting reagent
0.036 molesofCprovides0.012 molesofAB2C3.

0.012 molesofAB2C3weighs4.8 g
1 moleofAB2C3weighs4.80.012=400 g mol-1
400=60+2B+3×80
B=50 amu

Stream:JEESubject:ChemistryTopic:Mole ConceptSubtopic:Miscellaneous/Mixed
2mℹ️ Source: PYQ_2015

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