In the early days of automobiles, illumination at night was provided by burning acetylen, c2h2. though no longer used as a source of light by some cave explores. the acetylene is (was) prepared in the lamp by the reaction of water wih calcium carbide cac2:
cac2 + h2o --> ca(oh)2 + c2h2
calculate the standard enrthalpy of the reaction. the h of cac2 is -15.14 kcal/mol.

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