Răspuns:
1.
MMg=24g/mol
n=m/M
n=48g /24g/moli=2moli Mg
1mol Mg-............................6,023 .10²³ atomi Mg
2moli Mg...........................x atomi Mg
x=2 x 6,023 x10²³/1=calculeaza
2.
MCa=40g/mol
m=nxM=1,5x40=calculeaza
3.
MSO3=32+3x16=80g/mol
n=m/M=160/80=2moli SO3
4.
mCO2=88g
nCO2=?
nr molecule CO2=?
MCO2=12+2×16=44 u.a.m
n=m\M=88g/44g/mol=2 moli
1mol ..........6,023×10²³ molecule
2moli...............x molecule
x=2×6,023×10²³/1=calculează
Explicație:
