W(NaCl)=1.966g/58.5g/mol=0.0341mol
v(NaCl)=1.966g*2.17g/ml=4.267ml
v(H2O)=200-4.267=195.733ml/1000=0.195733 L
Cм=0.0341mol/0.195731L=0.174mol/L=0.174M
<span><span>2 <span>CH3COOK</span></span> + <span>H2SO4</span>→<span>K2SO4</span>+<span>2<span>CH3COO
</span></span></span><span><span><span>C2H6O</span></span>+<span>2<span>K2Cr2O7</span></span>+<span>8<span>H2SO4</span></span>→<span>3<span>CH3COOH</span></span>+<span>2<span>Cr2<span>(SO4)</span>3</span></span>+<span>2<span>K2SO4</span></span>+<span>11<span>H2<span>O
</span></span></span></span>
2Zn+O2=2ZnO;
M(Zn)=65 г/моль; n(Zn)=m(Zn) / M(Zn)=130 / 65=2 моль;
n(ZnO)=n(Zn)=2 моль (по уравнению реакции);
M(ZnO)=81 г/моль; m(ZnO)=n(ZnO) * M(ZnO)=2 * 81=162 г.
Fe + O2 = FeO
FeO + HCl = FeCl2 + H2O
FeCl2 + NaOH = Fe(OH)2
Fe(OH)2 + H2SO4 = FeSO4 + H2O
<span>FeSO4 + HNO3 = Fe(NO3)2 + H2SO4
</span>FeSO4 + H2 = H2SO4 + Fe
Находи свое, расставляй коэфицеенты