Question

You are Seema Bhatt. You wish to place an order for a copy of the book 'It was Five Minutes

Past Midnight' written by Dominique Lappierre , with Messrs UBS Publishers and

Distributers,Ansari Road, Delhi. Write a letter requesting them to mail you a copy by VPP

(VALUE PAYABLE POST)​

Answer 1

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By designing mass spectrometers that can determine m/z values accurately to four decimal places, it is possible to distinguish different formulas having the same nominal mass. The table on the right illustrates this important feature, and a double-focusing high-resolution mass spectrometer easily distinguishes ions having these compositions.