The following two-way table describes student's after school activities. Find the probability that a
randomly selected student either does sports or
works.
Grade
Sports
Music/Drama
Work
Sophomore
20
7
3
Junior
20
13
2.
Senior
25
5
5
P(Sports U Work) = [ 2 ]%
Round to the nearest whole percent.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

i wish i could but this one is weird give me abc and i can solve it.

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