hoa

D

daihoctqt

L

levietdung1998

\[\begin{array}{l}
{m_{{O_2}}} = {m_{oxit}} - {m_{hh}}\\
O_2^0\,\,\,\,\,\,\,\, + 4e \to 2{O^{ - 2}}\\
0,175 - > 0,7\\
2{H^{ + 1}} + 2e \to H_2^0\\
1.V - - > V\\
\to V = 0,7
\end{array}\]
 
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