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CBSE Class 11-science Answered

2.45 g of KclO3 is heated to give O2 which is allowed to react completely with H2 obtained from the reaction of zinc with sulphuric acid.What is the amount of zinc required for the complete reaction?

Asked by pb_ckt | 19 May, 2019, 11:53: PM
Expert Answer
Dissociation KClO3 -
 
2 K C l O subscript 3 rightwards arrow 2 K C l plus 3 O subscript 2

2 space m o l e s space o f space K C l O subscript 3 space p r o d u c e equals 3 space m o l e s space o f space O subscript 2
fraction numerator 2.45 over denominator 122.5 end fraction space w i l l space p r o d u c e equals 2 over 3 cross times left parenthesis fraction numerator 2.45 over denominator 122.5 end fraction right parenthesis
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 0.66 cross times 0.02
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space.0132 space m o l e s space o f space O subscript 2
2 straight H subscript 2 plus straight O subscript 2 rightwards arrow 2 straight H subscript 2 straight O
since space straight O subscript 2 space and space straight H subscript 2 space is space fully space consumed space when space we space have space.0132 space moles space of space straight O subscript 2
therefore space according space to space reaction space 1 space mole space straight O subscript 2 space gives space 2 space mole space hydrogen
.0132 space moles space will space produce space equals 2 cross times.0132 space moles space of space hydrogen
space space

Zn space plus space straight H subscript 2 SO subscript 4 rightwards arrow ZnSO subscript 4 plus straight H subscript 2
So space we space have space 2 cross times.0132 space moles.
1 space mole space straight H subscript 2 space gives space 1 space mole space of space Zn
1 space mole space of space Zn equals 65 straight g

F o r space 2 cross times.0132 space mole space of space H subscript 2 space equals 65 cross times 2 cross times.0132
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 1.716 space g space o f space Z n space i s space r e q u i r e d
Answered by Ravi | 20 May, 2019, 05:45: PM
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