At the start of the coal combustion experiment, the combined mass of the coal and oxygen reactants was 100 grams. At the end of the coal combustion
experiment
, the mass of the sample was 100 grams. Why does the scale
showing the mass at the end of the reaction give a mass of 100 grams, when
there is only a small amount of solid particles remaining on the scale?

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

level 4 to level 2 : ))