1. How many isotopes are depicted in the mass spectrum data above? 2. Which peak (A, B, C) shows the isotope with the greatest abundance in nature?
3. Which peak shows the isotope with the greatest number of neutrons?
4. The average atomic mass of this element is probably closest to ? AMU because:
5. What is the likely identity of element Z?
6. What is the atomic number of element Z?

i do not get it   at all

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole