Hòa tan 5,85g NaCl vào 50g nước thu được sung dịch X (có d=1,2g/ml). Tính nồng độ phần trăm và nồng độ mol/l của dung dịch X.
cho mình xin lời giải chi tiết ạ.
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\(C\%=\dfrac{30}{170}.100\%=17,647\%\)
\(V_{\text{dd}}=\left(30+170\right)1,1=220ml\)
\(n_{NaCl}=\dfrac{30}{58,5}=0,513mol\)
\(C_M=\dfrac{0,513}{0,22}=0,696M\)
\(C\%_{NaCl}=\dfrac{30}{170+30}.100\%=15\%\\ C_M=C\%.\dfrac{10D}{M}=10.\dfrac{10.1,1}{58,5}=1,88M\)
Ta có: \(\dfrac{m_{NaCl}}{m_{ddNaCl}}.100\%=40\%\)
\(\Rightarrow m_{ddNaCl}=125\left(g\right)\)
a.\(C\%_{NaCl}=\dfrac{9}{91+9}.100\%=9\%\)
b.\(m_{NaCl}=0,5.58,5=29,25g\)
\(C\%_{NaCl}=\dfrac{29,25}{29,25+300}.100\%=8,88\%\)
a) \(C\%=\dfrac{9}{9+91}.100\%=9\%\)
b) \(m_{H_2O}=300.1=300\left(g\right)\)
\(C\%=\dfrac{0,5.58,5}{0,5.58,5+300}.100\%=8,88\%\)
\(n_{P_2O_5}=\dfrac{14.2}{142}=0.1\left(mol\right)\)
\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
\(0.1............................0.2\)
\(m_{H_3PO_4}=0.2\cdot98=19.6\left(g\right)\)
\(m_{dd_{H_3PO_4}}=14.2+185.8=200\left(g\right)\)
\(C\%H_3PO_4=\dfrac{19.6}{200}\cdot100\%=9.8\%\)
\(V_{dd_{H_3PO_4}}=\dfrac{200}{1.1}=181.8\left(ml\right)=0.1818\left(l\right)\)
\(C_{M_{H_3PO_4}}=\dfrac{0.2}{0.1818}=1.1\left(M\right)\)
Ta có: \(n_{P_2O_5}=\dfrac{14,2}{142}=0,1\left(mol\right)\)
PT: \(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
____0,1_____________0,2 (mol)
\(\Rightarrow m_{H_3PO_4}=0,2.98=19,6\left(g\right)\)
Có: m dd sau pư = mP2O5 + mH2O = 200 (g)
\(\Rightarrow C\%_{H_3PO_4}=\dfrac{19,6}{200}.100\%=9,8\%\)
Có: V dd sau pư = \(\dfrac{200}{1,1}=\dfrac{2000}{11}\left(ml\right)=\dfrac{2}{11}\left(l\right)\)
\(\Rightarrow C_{M_{H_3PO_4}}=\dfrac{0,2}{\dfrac{2}{11}}=1,1M\)
Bạn tham khảo nhé!
Ta có: \(m_{dd}=300\cdot1,05=315\left(g\right)\) \(\Rightarrow C\%_{Na_2CO_3}=\dfrac{15,9}{315}\cdot100\%\approx5,05\%\)
Mặt khác: \(n_{Na_2CO_3}=\dfrac{15,9}{106}=0,15\left(mol\right)\) \(\Rightarrow C_{M_{Na_2CO_3}}=\dfrac{0,15}{0,3}=0,5\left(M\right)\)
a) Ta có: \(n_{NaCl}=\dfrac{5,85}{58,5}=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,1}{0,5}=0,2\left(M\right)=\left[Na^+\right]=\left[Cl^-\right]\)
b) Ta có: \(n_{Ba\left(OH\right)_2}=\dfrac{34,2}{171}=0,2\left(mol\right)\)
\(\Rightarrow C_{M_{Ba\left(OH\right)_2}}=\dfrac{0,2}{0,5}=0,4\left(M\right)\) \(\Rightarrow\left\{{}\begin{matrix}\left[Ba^{2+}\right]=0,4\left(M\right)\\\left[OH^-\right]=0,8\left(M\right)\end{matrix}\right.\)
c) Ta có: \(n_{H_2SO_4}=0,025\cdot2=0,05\left(mol\right)\)
\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,05}{0,125+0,025}\approx0,33\left(M\right)\) \(\Rightarrow\left\{{}\begin{matrix}\left[H^+\right]=0,66\left(M\right)\\\left[SO_4^{2-}\right]=0,33\left(M\right)\end{matrix}\right.\)