This question is based on the mass spectrum of diethyl sulfide (CH3CH2SCH2CH3) which can be found...

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This question is based on the mass spectrum of diethyl sulfide(CH3CH2SCH2CH3) which can be found at this link...http://webbook.nist.gov/cgi/cbook.cgi?ID=C352932&Mask=200 Youwill need java to see this spectrum! Identify the ion fragment thathas a mass of 29.
a) C2H5SC2H5+
b)C4H10+
c) C2H5+
d) S+

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3.9 Ratings (780 Votes)

In the given options the Molar mass of C₂H₅⁺ is =(2xAt.mass of C ) + (5xAt.mass of H )

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = ( 2x12) + (5x1)

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 29 g/mol

This is the only fragment having mass 29 so the correct answer is (c)

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