CAC ban oi hay giup bõ hoa ngay cang lon manh nhe.............cac ban lam giup to bai nay nhe

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oack

có[TEX] \frac{m_{NaCl}}{m_{NaCl}+m_{H_2O}_{(1)} } =25%(1)[/TEX]
[TEX]\frac{m_{NaCl}}{m_{NaCl}+m_{H_2O}_{(2)}} =30 %[/TEX]
để tmdb
thì [TEX]m_1.0,25=m_2.0,3[/TEX]
\Rightarrow [TEX]m_2=\frac{5.m_1}{6}[/TEX]
từ (1) tính đc [TEX]m_1[/TEX] sau đó -->[TEX] m_2[/TEX]
 
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