Răspuns:
Explicație:
nr. atomi si nr. molecule din 1g oxigen
molecule H2O
MO2= 32----->32g/moli
-se afla nr. moli din 1g oxigen
n= 1g : 32 g/moli=0,03125 moli O2
1mol O2-----------2 . 6,023 .10²³atomi
0,03125moli--------------x
x=0, 03125 . 2 . 6,023.10²³ atomi=0,376.10²³atomi oxigen
1mol O2---------6,023.10²³molecule O2
0,03125 moli-----------ymolecule
y=0,03125 . 6,023.10²³=0,188 .10²³molecule O2
verifica calculele !
1g xg
2H2 + O2 = 2H2O
32g 2.18g
x=1 . 36 : 32=1,125g H2O
n= 1,125g : 18g/moli=0,0625 moli H2O
1mol H2O--------6,023.10²³molecule H2O
0,0625moli---------z molecule H2O
Z=0,0625 . 6,023.10²³molecule H2O=
[calculeaza singur!]
