Can someone please help me with these 2 questions? I\'m so confused :( 3. Calcul

Question

Can someone please help me with these 2 questions? I'm so confused :(

3. Calculate the molecular formula for each MS below, if possible. (7 points) 100 100 9.1 9.1 8.7 100 3.3 60 150 26.9 2.7 230 57 232 2.6 20 40 60 80 100 120 140 160 180 200 220 240 m/z m/ z 8.9 12.1 18.7 12.6 9.9 1.9 51 Natural Abundance of Other Isotopes (Based on 100 Atoms of Common 10.9 Element Most Common I 60 17.2 151 2.1 76 100 100 100 100 100 100 100 100 100 100 100 7.7 2.9 5.9 1.11 0.016 0.38 0.04 0.20 6.3 5.10 3.35 31p 4.40 32.5 98.0 Sulfur 0.78 100 150 m/z Data obtained from Silverstein, R. M.: Webster, F X. Spectrometric Identification of Organic Compounds, 6th ed. Wiley New York, 1996: 7

Explanation / Answer

Fragment mass Compound structure 141(M-1) A or B or D radical of A 113 (M-29) D Loss of carbon on the ketone side 87 (M-55) C6 carbon radical chain without any oxygen or double bond 57 (M-85) C4 carbon chain radical without any oxygen or double bond

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