с одним во по химии!!!

cuo+2hcl=cucl2+h2o

cucl2+naoh+сuohcl+nacl

  сuohcl +naoh=cu(oh)2+nacl

  cu(oh)2 +2hno3=cu(no3)2+2h2o

  cu(no3)2 +na2co3=cuco3+2nano3 

2ch4=c2h2+3h2

n(ch4)=64/16=4моль

n(c2h2)=4/2=2моль

v(c2h2)=2*22.4=44.8л

li+02=li2o

li2o+h2o=lioh

lioh+nao2=nano3

na+o3=na2o2

na20+h2o=naoh

naoh+h2so4=naso4+h2o

na2o+h3po4=na3po4+h2o 

c9h10o + cl2 = c9h9clo + hcl => c9h10o + cl2 = c9h9clo + hcl