Could I get some help plz? There's my question below :) Label the following as redox or non-redox reactions.

2 KBrO3 (s) --> 2 KBr (s) + 3 O2 (g)
MnBr2 (aq) + 2 AgNO3 (aq) --> Mn(NO3)2 (aq) + 2 AgBr (s)
PCl3 (l) + Cl2 (g) --> PCl5 (s)
Cu (s) + 2 AgNO3 (aq) --> Cu(NO3)2 (aq) + 2 Ag (s)

an honest friend. a friend who cares about me, and wont use me. a friend that i can trust. not someone who is fake

mark this brainliest lol i need one more.

12 is it do you think so

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