Question

Tính nồng độ % và nồng độ mol của 400g dung dich NaCl trong đó có chứa 60g NaCl (biết D=1,1g/ml)

Answer 1

\(C\%_{NaCl}=\dfrac{60}{400}\cdot100\%=15\%\)

Ta có: \(\left\{{}\begin{matrix}n_{NaCl}=\dfrac{60}{58,5}=\dfrac{40}{39}\left(mol\right)\\V_{NaCl}=\dfrac{400}{1,1}=\dfrac{4000}{11}\left(ml\right)=\dfrac{4}{11}\left(l\right)\end{matrix}\right.\) \(\Rightarrow C_{M_{NaCl}}=\dfrac{\dfrac{40}{39}}{\dfrac{4}{11}}\approx2,82\left(M\right)\)

 

Answer 2

Ta có: \(C\%_{NaCl}=\dfrac{60}{400}.100\%=15\%\)

\(V_{ddNaCl}=\dfrac{400}{1,1}=\dfrac{4000}{11}\left(ml\right)=\dfrac{4}{11}\left(l\right)\)

\(n_{NaCl}=\dfrac{60}{58,5}=\dfrac{40}{39}\left(mol\right)\)

\(\Rightarrow C_{M_{NaCl}}=\dfrac{\dfrac{40}{39}}{\dfrac{4}{11}}\approx2,82M\)

Bạn tham khảo nhé!