\(C_2:CTPT:X_2O_x\\ \Rightarrow\frac{2X}{16x}=\frac{74,194}{25,806}\Leftrightarrow x=0,04X\left(1\right)\\ 2X+16x=1,9375.32\Leftrightarrow x=\frac{62-2X}{16}=\frac{31-X}{8}\left(2\right)\\ \left(1\right)\left(2\right)\Rightarrow\frac{31-X}{8}=0,04X\Leftrightarrow X\approx23\\ \rightarrow X:Na\left(Natri\right)\\ \rightarrow x=0,04X=1\\ \rightarrow CTHH:Na_2O\)
B2:Gọi CTPT là X2Ox
Có: \(\frac{M_X}{M_O}=\frac{2X}{16x}=\frac{74,194}{25,806}\)
=>x=0,04X(1)
Mà 2X+16x=1,9375.32<=>x=(31-X)/8(2)
(1)(2)=> X\(\approx23\left(TM\right)\)
=> CTHH: Na2O
#Walker
Bài 2 :
Gọi CTHH là X2Ox
Có: \(\%O=\frac{16x}{2X+16x}100\%=74,194\%\)
=> 2X + 16x = 1,9375 . 16 . 2
=> \(\left\{{}\begin{matrix}X=23\\x=1\end{matrix}\right.\)
Vậy CTHH : Na2O
2.
CTHH: X2Oy
Theo đề bài, ta có:
%O = \(\frac{16y}{2X+16y}.100\%\) = 74,194%
2X + 16y = 1,9375.32 =
<=> X = 23 ; y = 1
=> X là Na
CTHH: Na2O
CTPT: x2Ox
ta có : \(\frac{16n}{2x+16n}.100\%\)
= 74,194
2x+16n=19 .1,9375.16.2
=> x=23( Natri)
n=1
CTHH: Na2O