Question

dau coroana help chimie​

Answer 1

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: