Question

Folosind masa miolara, calculati compozitia procentuala a urmatoarelor substante:
a)CaCO3
b)CaO
c)CH4
d)MgCl2

Va rog mult ajutor!!!​

Answer 1

CaCO3

-se afla masa molara

MCaCO3=40+12+3.16=100

100g CaCO3--------40g Ca------------12 g C----------48 g O

100g-------------------x------------------------y--------------------z

x=100.40:100=40% Ca

y=12% C

z=48% O

CaO

M=40+16=56------>56g/moli

56g CaO---------40 g Ca-----------16 g O

100 g-------------------x-------------------y

x=100.40: 56=

y=100.16 : 56=

CH4

M=12+4=16------->16g/moli

16g CH4---------------12g C----------------4gH

100g---------------------x---------------------------y

x=100.12 :16=

y=100.4 : 16=

MgCl2

M=24+71=95------->95g/moli

95g---------24g Mg----------------71g Cl

100g------------x-------------------y

rezolva singur mai departe!!!!!!!!!!!!!