Put the verbs in the correct form,and you will get a story i (study) english at boston university.i - id690188320210726 от Weltrаum 26.07.2021 19:55

Question

Химия: Put the verbs in the correct form,and you will get a story i (study) english at boston university.i (be) on holiday at the moment and i (work) at the public library.i (be) lucky to have this job.the library (open) at 10 and (close) at 7.it (be) an interesting job because people (come) and (ask) me to help them so so i (learn) a lot about different subjects.i (enjoy) the job and (find) it very amusing.people (use) the strangest things as bookmarks.i have a piace of bacon once! matchsticks (be) common

Weltrаum · Accepted Answer

1) CH3-CH2-OH--(H2SO4,t)-- CH2=CH2+H2O     CH2=CH2+Br2-- BrCH2-CH2Br m(Br2)=w*m=160*0,05=8 моль n(Br2)=m/M=8/160=0,05 моль n(Br2):n(CH2=CH2)=1:1-- n(CH2=CH2)=0,05 моль n(CH2=CH2):n(CH3-CH2-OH)=1:1-- n(CH3-CH2-OH)=0,05 моль m(CH3-CH2-OH)=n*M=0,05*46=2,3 г ОТВЕТ: 2,3 г 2)CuSO4+2NaOH=Na2SO4+Cu(OH)2↓ n(Cu(OH)2)=m/M=9,8/98=0,1 моль n(Cu(OH)2);n(CuSO4)=1:1--- n(CuSO4)=0,1 моль m(CuSO4)=n*M=0,1*160=16 г K2CO3+2HCl=2KCL+H2O+CO2 n(CO2)=V/Vm=4,48/22,4=0,2 моль n(CO2):n(K2CO3)=1:1-- n(K2CO3)=0,2 моль m(K2CO3)=n*M=0,2*138=27,6...

MOGZ ответил