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Question

Which one of the following statements is false for 0.5mol C2H6? (C=12, H=1 and take Avogadro number =6×1023


A
It is 15 g
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B
It includes molecules
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C
It includes 1mol C atom
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D
It includes 4 atoms
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Solution

The correct option is D It includes 4 atoms

molar mass of C2H6 =2.(12) + 6.(1)=30g/mol , 1mol C2H6 is 30g/mol 0.5mol C2H6 is=15 g/mol A is true

1mol C2H6 includes 6×1023
C2H6 molecule, 0.5mol C2H6 includes C2H6 molecules = 3×1023 C2H6 molecules B is true

1mol C2H6 includes 2mol C atoms 0.5mol C2H6 include?mol C atoms, =1mol C atom, C is true

1mol C2H6 includes 8NA atoms 0.5mol C2H6 includes = 4NA atoms, D is false.


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