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Molecular weight of perchloroethylene is approximately? (Cl-35.5, C-12)

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Molecular weight of perchloroethylene is approximately? (Cl-35.5, C-12)

(a) 165

(b) 166

(c) 167

(d) 168

This question was addressed to me in a national level competition.

My query is from Organic Chemicals topic in division Chemical Industries of Chemical Technology

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The correct option is (b) 166

Easiest explanation: Perchloroethane’s formula is C2Cl4. Therefore, its weight will be 12*2+35.5*4 = 166.

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