A. CaCO3 = ___ Ca, ___ C, ___O b. (NH4)2SO4 = ___N, ___H, ___S, ___O

c. 3 H2 = 2H d. 4 Mg(OH)2 = 4Mg, 8O,8H

e. Ba(NO3)2 = 1Ba, ___ N, ___ O

I did c on my own, is it right?? I also need help understanding the concept of this... I'm confused on the rest of the questions.

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