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Question

CaC2+H2OCaO+HCCHn(CHCH)+nH2(CH2CH2)nPolyethylene can be produced from calcium carbide according to the given sequence of reactions.
The mass of polyethylene that can be produced from 20.0 kg of pure CaC2 is :

A
6.75 kg
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B
7.75 kg
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C
8.75 kg
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D
9.75 kg
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Solution

The correct option is C 8.75 kg
From the given sequence of reactions, it can be seen that one mole of CaC2 gives one mole of polyethylene.

So, 20 kg will give moles of CaC2=2000064 moles= number of moles of polyethylene

Mass of polyethylene =n×28=2000064×28=8.75 kg

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