Question

Cat % oxigen se afla in apa!!
Cat % oxigen se afla in dioxid de carbon!!

Answer 1

a).In 18 g...2 g H... 16 g O
In 100 g...x........y
x=(100*2)/18=11,11%H
y=(100*16)/18=88,88%O
b).In 44g ....12 g C....32 g O
    In 100 g....x..........y
x=(100*12)/44=27,27%C
y=(100*32)/44=72,72% O

Answer 2

H2O - apă
M H2O = 2*1+16 = 18 g/mol
%O = mO/m H2O * 100 = 16/18 * 100 = 88,88%

CO2 - dioxid de carbon
M CO2 = 12+2*16 = 44 g/mol
%O = mO/m CO2 * 100 = 2*16/44 * 100 = 72.72%