Which of the following aqueous solutions are good buffer systems?
.
a. 0.33 M acetic acid + 0.21 M sodium acetate .
b. 0.22 M hydroiodic acid + 0.25 M sodium iodide .
c. 0.10 M potassium hydroxide + 0.29 M potassium bromide .
d. 0.19 M hydrocyanic acid + 0.16 M sodium cyanide .
e. 0.33 M ammonium bromide + 0.34 M ammonia .

select all that apply

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

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.