Смесь бензола и стирола обесцветила бромную воду массой 500 г (массовая доля Br2 в бромной воде равна 3, 2% При сгорании смеси

решение задания по химии
 

n(Br2) = 500*0,032/160 = 0,1 моль
n(CO2) = 44,8/22,4 = 2 моль
n(C) = 2 моль = 6n(C6H6) + 8n(C6H5CHCH2)
n(Br2) = n(C6H5CHCH2)
2 моль = 6n(C6H6) + 8*0,1 моль
n(C6H6) = 0,2 моль
m(C6H6) = 0,2*78 = 15,6 г
m(C6H5CHCH2) = 0,1*104 = 10,4 г
ω(C6H6) = (15,6/(15,6 + 10,4))*100% = 60%
Ответ: 60%

it   was   july   16,   2008   and   i   was   at   city   hall   to   do   something   thatwould change my life forever. i went to room 302 and got my workingcard.   i   thought   i   was   independent   and   ready   to   get   a   job.

first i filled in applications. i put in over 100 applications at restau-rants, clothing stores, and hotels. i kept looking for a job, and i decidedto   go   to   the   mall.   i   was   interested   in   getting   a   place   in   one   restaurantbecause my good school friend worked there, and he told me they neededpeople.   i   thought   it   might   turn   out   to   be   successful.

one   day,   when   i   came   home   and   turned   on   the   answering   machine,there was a message on it. it was a job! a lady from a supermarket calledme   for   an   interview   on   tuesday.   i   was   very   excited.   this   was   my   first  interview.   on   sunday   i   got   up   early,   my   mom   and   i   went   shopping   fora dress. i put on this dress on tuesday. the lady asked me a lot of questi-ons,   but   i   thought   over   the   answers   the   day   before.

i   didn’t   get   the   job,   but   i   found   out   that   you   can’t   get   a   job   easily.it’s   very   hard   work.

it   was   july   16,   2008   and   i   was   at   city   hall   to   do   something   that would change my life forever. i went to room 302 and got my workingcard.   i   thought   i   was   independent   and   ready   to   get   a   job.

first i filled in applications. i put in over 100 applications at restau-rants, clothing stores, and hotels. i kept looking for a job, and i decidedto   go   to   the   mall.   i   was   interested   in   getting   a   place   in   one   restaurantbecause my good school friend worked there, and he told me they neededpeople.   i   thought   it   might   turn   out   to   be   successful.

one   day,   when   i   came   home   and   turned   on   the   answering   machine,there was a message on it. it was a job! a lady from a supermarket calledme   for   an   interview   on   tuesday.   i   was   very   excited.   this   was   my   first  interview.   on   sunday   i   got   up   early,   my   mom   and   i   went   shopping   fora dress. i put on this dress on tuesday. the lady asked me a lot of questi-ons,   but   i   thought   over   the   answers   the   day   before.

i   didn’t   get   the   job,   but   i   found   out   that   you   can’t   get   a   job   easily.it’s   very   hard   work.