Only six elements make up 99% of the human body's mass. the six elements are
a. carbon, oxygen, hydrogen, nitrogen, calcium, and sodium.
b. carbon, oxygen, hydrogen, nitrogen, calcium, and phosphorus.
c. oxygen, hydrogen, nitrogen, calcium, phosphorus, and sodium.
d. oxygen, hydrogen, nitrogen, calcium, phosphorus, and zinc.

B:

Although there are almost 100 elements in nature, only six of them compose 99% of our body’s mass— carbon, oxygen, hydrogen, nitrogen, calcium, and phosphorus.

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