The recommended daily intake of zinc ions, Zn2+, expressed in moles, is 2.29 x 10-4 mol for adults. How many zinc ions (hint: particles) should an adult consume each day?

1.38 × 10²⁰ zinc ions

Explanation:

Step 1: Given data

Moles of Zn²⁺: 2.29 × 10⁻⁴ mol

Step 2: Convert 2.29 × 10⁻⁴ moles to ions

To convert moles to ions, we need a conversion factor: Avogadro's number. There are 6.02 × 10²³ Zn²⁺ ions in 1 mole of Zn²⁺ ions.

2.29 × 10⁻⁴ mol × 6.02 × 10²³ ions/1 mol = 1.38 × 10²⁰ ions

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