Đáp án: A
Giải thích các bước giải:
Khối lượng dng dịch là:
mdung dịch= mchất tan + mdung môi = 10 + 40 = 50 (gam)
Nồng độ phần trăm của dung dịch thu được là:
C%=mct/mdd . 100=10/50 .100=20%
Đáp án:
B
\(\begin{array}{l}{m_{{\rm{dd}}CuC{l_2}}} = {m_{CuC{l_2}}} + {m_{{H_2}O}} = 10 + 40 = 50g\\{C_\% }CuC{l_2} = \dfrac{{{m_{CuC{l_2}}}}}{{{m_{{\rm{dd}}CuC{l_2}}}}} \times 100\% = \dfrac{{10}}{{50}} \times 100 = 20\% \end{array}\)
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