Chọn D. Ta có: \(V=\dfrac{m}{D}.\) Khi \(m_d=m_n\) thì \(V_d.D_d=V_n.D_n\)
Mà \(V_n=1 lít\), \(V_d=5 lít\)
\(\Rightarrow D_d=\dfrac{4}{5}D_n\) hay \(D_n=\dfrac{5}{4}.\)
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