Question

Se dau acizii:
acid sulfuros, acid sulfuric acid sulfhidric
Sa se determine:
a) raportul atomic de combinare (molar)
b) raport masic de combinare
c) compozitia procentuala de masa

Answer 1

acid sulfuros = H2SO3

raport atomic:

aven 2 at H la 1 at S la 3 at O

=> H : S : O = 2 : 1 : 3

raport masic

avem 2x1g H + 1x32g S + 3x16g O

=> H : S : O = 2 : 32 : 48 /:2 = 1 : 16 : 24

compozitie procentuala

avem 2x1g H + 1x32g S + 3x16g O = 82 g/mol

82g .............. 2g H ....... 32g S ....... 48g O

100%(g) ....... a% ............ b% ........... c%

                 = 2,44%      = 39,02%  = 58,54%

acid sulfuic = H2SO4

folosesti acelasi principiu ca mai sus....

acid sulfhidric = H2S

raport atomic:

aven 2 at H la 1 at S

=> H : S = 2 : 1

raport masic

avem 2x1g H + 1x32g S

=> H : S = 2 : 32/:2 = 1 : 16

compozitie procentuala

avem 2x1g H + 1x32g S = 34 g/mol

34g .............. 2g H ....... 32g S

100%(g) ....... a% ............ b%

                 = 5,88%      = 94,12%