According to the brønsted-lowry definition, in which of the following reactions does water act as an acid?
a) hc2h3o2(aq) + h2o(l) → h3o+(aq) + c2h3o2-(aq)
b) h2o(l) + no2-(aq) → hno2(aq) + oh-(aq)
c)hcl + h2o(l) → h3o+(aq) + cl-(aq)
d)h2o(l) + nh4+(aq) → h3o+(aq) + nh3(aq)

it's c. elements are placed in rows based on how may valencies electrons have.

може ли да зареждате повече информация, моля

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

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.