15 did henry moseley affect the development of the periodic table?
a. he discovered that the number of valence electrons increase to a
full octet.
b. he discovered that groups of elements have similar properties.
c. he discovered that neutrons affect an element's atomic mass.
d. he discovered that each element has its own atomic number.

D

Explanation:

D. He discovered that each element has its own atomic number.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants

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