Доповніть текст словами, поданими нижче:
politics, part-time, problems, spots, boring, money, chore, appearance, guy, drugs, grades
I am a teenager so my life isn’t easy. I have many (1). My parents want me to get
good (2) at school. But I have so many subjects at school and some of them are
extremely (3). I have to do much homework and to read many foolish books, while
some teachers don’t understand that their subjects are not the most important things in my
life. Some of my friends worry a lot about their (4) and their teenage (5)
which spoil our lives! I must confess that (6), alcohol and AIDS don’t really bother
me or my friends. The same I should say about (7). What we really care about is
how to impress a cute (8) or an attractive girl. Of course I, like many other
teenagers, have problems with (9). Some of my friends found a (10) job in
order to have an opportunity to earn some money. But despite all these problems, the life of a
teenager today isn’t a (11), it is still fun.
1) NH3 = (NH4)2CO3 = (NH4)2SO4 = NH4Cl = NH3
1. 2NH3+H2O+CO2=(NH4)2CO3
2. (NH4)2CO3+H2SO4=(NH4)2SO4+CO2+H2O
3. (NH4)2SO4+2NaCl=2NH4Cl+Na2SO4
4. NH4Cl=NH3+HCl
2) Дано:
m(Ca(OH)2)=1,48 г
m((NH4)2SO4)=3 г
Найти: V(NH3) - ?
Решение: Ca(OH)2+(NH4)2SO4=CaSO4+2NH3+2H2O
n(Ca(OH)2)=m/M=1,48 г/74 г/моль=0,02 моль
M(Ca(OH)2)=40+16*2+1*2=74 г/моль
n(Ca(OH)2):n((NH4)2SO4)=1:1 -> n((NH4)2SO4)=0,02 моль (равны)
n(Ca(OH)2):n(NH3)=1:2
n(NH3)=0,04 моль
V(NH3)=nVm=0,04 моль *22,4 л/моль=0,896 л. (можем округлить до 0,9 л.)
ответ: 0,9 л.
Объяснение: