12 which step would a student find the molecular formula of a compound from the empirical formula?
a. multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.
b. subtract the ratio of the actual mass of the compound to the empirical formula mass from the subscripts of the empirical formula.
c. divide the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.
d. add the ratio of the actual mass of the compound to the empirical formula mass to the subscripts of the empirical formula.

A. Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Explanation:

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