Elemental phosphorus reacts with chlorine gas according to the equation
P4(s) + 6C12(g)+4PC13 (1)
A reaction mixture initially contains 45.63 g P4 and
131.4 g Cl.
Once the reaction has reached completion, what mass (in g) of the excess reactant is left?
Express the mass in grams to three significant figures.

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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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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