4.
a. `V_{N_2(đktc)}=22,4.n=22,4.2,45=54,88(l)`
b. `V_{O_2(đktc)}=22,4.n=22,4.3,2=71,68(l)`
c. `V_{CO_2(đktc)}=22,4.n=22,4.1,45=32,48(l)`
d. `V_{CO_2(đktc)}=22,4.n=22,4.0,15=3,36(l)`
e. `V_{NO_2(đktc)}=22,4.n=22,4.0,2=4,48(l)`
f. `V_{SO_2(đktc)}=22,4.n=22,4.0,02=0,448(l)`
5.
a. `V_{H_2(đktc)}=22,4.n=22,4.0,5=11,2(l)`
b. `V_{O_2(đktc)}=22,4.n=22,4.0,8=17,92(l)`
c. `V_{CO_2(đktc)}=22,4.n=22,4.2=44,8(l)`
d. `V_{CH_4(đktc)}=22,4.n=22,4.3=67,2(l)`
e. `V_{N_2(đktc)}=22,4.n=22,4.0,9=20,16(l)`
f. `V_{H_2(đktc)}=22,4.n=22,4.1,5=33,6(l)`