cho 15 ml rượu etylic vào trong 60ml nước độ rượu thu được là
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Tham khảo :
$V_{dd}=V_{r}+V_{nước}=12+60=75(ml)$
Độ rượu $=\dfrac{V_{r}}{V_{dd}} \cdot 100=\dfrac{15}{75} \cdot 100=20^o$