Tóm tắt
$m_{ddHCL}$ = $150g$
C% = 20%
$m_{ctHCL}$ = $?g$
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C% = $\frac{m_{ctHCL}}{m_{ddHCL}}$ . $100%$
⇒ $m_{ctHCL}$ = $\frac{m_{ddHCL}.C%}{100}$
⇔$m_{ctHCL}$ = $\frac{150 . 20}{100}$ = $30g$
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