What is the mass of 3.5 moles of helium gas?

1 mole is equal to 1 moles Helium, or 4.002602 grams.

Explanation:

14.009.107‬

Explanation:

Moles to Grams helium

1 mole is equal to 1 moles Helium, or 4.002602 grams

4.002602 x 3=  12.007.806

4.002602 : 2 = 2.001.301

12.007.806+2.001.301= 14.009.107‬

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