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nH2 = \(\frac{1,68}{22,4}\) = 0,075 (mol)
Mg + 2HCl \(\rightarrow\) MgCl2 + H2\(\uparrow\) (1)
0,075 <--------0,075 <--0,075 (mol)
MgO + 2HCl \(\rightarrow\) MgCl2 + H2O (2)
%mMg= \(\frac{0,075.24}{5,8}\) . 100% = 31,03 %
%m MgO = 68,97%
nMgO = \(\frac{5,8-0,075.24}{40}\) = 0,1 (mol)
Theo pt(2) nMgCl2 = nMgO= 0,1 (mol)
mdd sau pư = 5,8 + 194,35 - 0,075.2 = 200 (g)
C%(MgCl2) = \(\frac{95\left(0,075+0,1\right)}{200}\) . 100% = 8,3125%
PTHH: \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
Ta có: \(n_{Na_2SO_4}=n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}\cdot\dfrac{10}{40}=0,125\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,125\cdot98}{10\%}=122,5\left(g\right)\\m_{Na_2SO_4}=0,125\cdot142=17,75\left(g\right)\end{matrix}\right.\)
\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{17,75}{10+122,5}\cdot100\%\approx13,4\%\)
\(a,PTHH:CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ n_{CuSO_4}=n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\\ \Rightarrow m_{CuSO_4}=0,1\cdot160=16\left(g\right)\\ b,n_{H_2SO_4}=n_{CuO}=0,1\left(mol\right)\\ \Rightarrow m_{CT_{H_2SO_4}}=0,1\cdot98=9,8\left(g\right)\\ \Rightarrow C\%_{H_2SO_4}=\dfrac{9,8}{200}\cdot100\%=4,9\%\)
a) 2NaOH + H2SO4 -- Na2SO4 + 2H2O
b) \(n_{NaOH}=\dfrac{100.20}{100.40}=0,5\left(mol\right)\)
PTHH: 2NaOH + H2SO4 -- Na2SO4 + 2H2O
______0,5----->0,25------>0,25
=> mH2SO4 = 0,25.98 = 24,5 (g)
=> \(m_{ddH_2SO_4}=\dfrac{24,5.100}{19,6}=125\left(g\right)\)
c) mNa2SO4 = 0,25.142 = 35,5 (g)
mdd sau pư = 100 + 125 = 225 (g)
=> \(C\%\left(Na_2SO_4\right)=\dfrac{35,5}{225}.100\%=15,778\%\)
nFe2O3=0.1(mol)
PTHH Fe2O3+6HCl->2FeCl3+3H2O
a)Theo pthh,nHCl=6 nFe2O3->nHCl =0.1*6=0.6(mol)
mHCl=0.6*36.5=21.9(g)
b)nFeCl3=0.2(mol)
mFeCl3=162.5*0.2=32.5(g)
mdd sau phản ứng:248+16=264(g)
C%muối=32.5:264*100=12.3%
nFe2O3 = 16/160 = 0,1 mol
a/ Fe2O3 + 6HCl -----> 2FeCl3 + 3H2O
(mol) 0,1 0,6 0,2
b/ Từ PTHH => nHCl = 6nFe2O3 = 0,6 mol
=> mHCl = 0,6 x 36,5 = 21,9 (g)
c/ nFeCl3 = 2nFe2O3 = 0,2 mol
=> mFeCl3 = 0,2 x 162,5 = 32,5 (g)
=> %FeCl3 = \(\frac{32,5}{248}.100\approx13,105\%\)
a, PTHH: \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
b. Ta có \(n_{Fe_2O_3}=\frac{16}{160}=0,1\) (mol)
Theo PTHH: \(n_{HCl}=6n_{Fe_2O_3}=6.0,1=0,6\) (mol)
=> \(m_{HCl}=0,6.36,5=21,9\) (g)
c, Theo PTHH: n FeCl3 = 0,2 (mol)
=> m FeCl3 = 0,2 . 162,5 =32,5 (g)
Áp dụng ĐLBTKL ta có:
\(m_{dd-sau-p.ư}=m_{Fe_2O_3}+m_{ddHCl}=16+248=264\left(g\right)\)
=> C% FeCl3 = \(\frac{32,5}{264}.100\%\approx12,31\%\)
nCuO=16/80=0,2(mol)
a) PTHH: CuO + H2SO4 -> CuSO4 + H2O
0,2___________0,2_____0,2(mol)
b) mCuSO4=160.0,2=32(g)
c) mH2SO4=0,2.98=19,6(g)
=>C%ddH2SO4= (19,6/100).100=19,6%
cảm ơn nha