SO2 + 2NaOH = Na2SO3 + H2O
Zn + 2HCl = ZnCl2 + H2
2Na + 2H2O = 2NaOH + H2
CuO + H2SO4 = CuSO4 + H2O
Na2CO3 + CaCl2 = CaCO3 + 2NaCl
m(CaCl2) = 140*0.19= 26.6
n(CaCl2) = 26.6/111= 0.24
n(CaCO3) = 0.24
m(CaCO3) = 0.24 * 100= 24
N=2 (моль)
M(Na2SO4) = 2*23+32+4*16 =142 (г/моль)
m= n*M = 2*142 = 284 (г)
W(S)= 32/142=0.225=22.5%
18.
ZnS + 2HCl → ZnCl₂ + H₂S↑
K + H2S = K2S + H2
K2S + 2HCl = 2KCl + K2S
2H₂S + 3O₂ → 2SO₂↑ + 2H₂O
SO2 + 2KOH = H2O + K2SO<span>3
</span>19.
Ca + 2H2O=Ca(OH)2 + H2
Ca(OH)2 + 2HNO2= Ca(NO2)2+2H2O
<span>Ca(NO2)2</span><span> + </span>2<span>H2O</span><span> = </span><span>Ca(OH)2</span><span> + </span>2<span>HNO2</span>
5<span>NH4HCO3</span><span> + </span>3<span>HNO3</span><span> = </span>4<span>NH4NO2</span><span> + </span>6<span>H2O</span><span> + </span>5<span>CO2
</span>20.
4Al + 3O2 = 2Al2O3
Al2O3 + 6HCl = 2AlCl3 + 3H2O
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
Al(OH)3 + NaOH = Na[Al(OH)4]
2Al(OH)3 + 3H2SO4 = Al2(SO4)3 + 6H2O
<span>Углеводы – пшеница, рожь, ячмень, кукуруза, рис.
+минеральные вещества </span><span>Химический состав семян:
Органические
белок крахмал жир </span><span>Неорганические
вода минеральные вещества</span>