Răspuns:
Explicație:
a. A
50 m mol= 0 ,05 moliH2O
M=H2O=2+16=18------>18g/moli
m= n.AM
m=0,05 moli.18g/moli=0,9 g H2O
b. A
MCO2=12+ 2.16=44------>44g/moli
n=88g : 44g/moli=2moli CO2
1mol CO2---------3.6,023.10²³atomi
2moliCO2 -----------X
X=2 .3 .6,023.10²³atomi= 36, 138.10²³atomi
c.
MO2=32------>32g/moli
n= 72,264.10²³ : 6,023.10²³=aprox. 12 moliO2
m=n.M
m= 12moli. 32g/moli=384 g
d. A
1mol SO3---------6,023 .10²³molecule SO3
22moli--------------------X
X=22 . 6,023.10²³=132, 506 .10²³molecule