Which equilibrium system has hco3- acting as a brønsted-lowry base? hco3- h+ + co3 2- hco3- :
+ hs- h2s + co32- hco3- :
+ h2s h2co3 + hs- :
hco3- + h2o h3o+ + co32- :
hco3- + o2- co32- + oh-

Answer is: HCO₃⁻ + H₂S → H₂CO3 + HS⁻.

According to  Bronsted-Lowry theory acid are donor of protons and bases are acceptors of protons (the hydrogen cation or H⁺).  

The bicarbonate anion (HCO₃⁻) is Bronsted base and it can accept proton and become conjugate acid H₂CO₃.

H₂S (hydrogen sulfide) is Bronsted-Lowry acid because it lost proton.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

gas

explanation:

smoke is the matter of a gas