If the density of copper (Cu) is 8.96 g/cm3 and that of zinc (Zn) is 7.13 g/cm3. Calculate and compare the volume of a pre-1982 penny to that of a post-1982 penny? Give one reason to support your answer

Answer with Explanation:

Density of copper(Cu)=

Density of zinc(Zn)=

Atomic mass of copper=

Atomic mass of zinc=65.38 g

We know that

Volume=

Using the formula

Volume of copper=

Volume of zinc=

Volume is inversely proportional to  the density.

Pre -1982 penny made by copper and post-1982 penny made by zinc.

Therefore, volume of post-1982 penny is greater than the volume of pre-1982 penny because density of zinc is less than the density of copper.

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