Question

Folosind masa moleculara,calculați compoziția procentuala a următoarelor substante:
a)CaO
b)CH4
c)MgCl2

Vă rog e urgent!!

Answer 1

CaO
MCaO=40+16=56

56g CaO---------40g Ca---------16 g O
100gCaO--------XgCa--------------YgO
X=100.40:56=71,42 la suta Ca
y=100.16:56=28,57 la suta O

CH4

MCH4=12+4=16
16 gCH4------------12gC---------4g H
100 gCH4-----------XgC------------YgH
X=100.12:16=75 la suta C
Y=100.4:16=25 la suta O



MgCl2
MMgCl2=24+2.35,5=95
95gMgCl2----------24 g Mg---------71 g Cl
100g------------------Xg-----------------Yg
x=100.24:95=25,26 la suta Mg
y=100.71:95=74,73 la suta Cl