ZnCl₂ + H-OH = Zn(OH)Cl + HCl
Zn²⁺+2Cl⁻ + H-OH = Zn(OH)⁺+Cl⁻ + H⁺+Cl⁻
Zn²⁺+H-OH = Zn(OH)⁺ + H⁺ реакция среды кислая
K₂S + H-OH = KHS + KOH
2K⁺+S²⁻ + H-OH = K⁺+HS⁻ + K⁺+ OH⁻
S²⁻ +H-OH = HS⁻ + OH реакция среды щелочная
Ответ:
дано
m(HCL) = 100 g
+Zn
-----------------
V(H2)-?
Zn+2HCL--->ZnCL2+H2
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 100 / 36,5 = 2.74 mol
2n(HCL) = n(H2)
n(H2) = 2.74 / 2 = 1.37 mol
V(H2) = n*Vm = 1.37 * 22.4 = 30.688 L
ответ 30.688 л
дано
m(CuSO4)= 60 g
n(NaOH) = 60 g
-----------------------
m(Cu(OH)2) -?
M(CuSO4) = 160 g/mol
n(CuSO4) = m/M = 60 / 160 = 0.375 mol
M(NaOH) = 40 g/mol
n(NaOH) = m/M = 60 / 40 = 1.5 mol
n(CuSO4) < n(NaOH)
CuSO4+2NaOH-->Na2SO4+Cu(OH)2
M(Cu(OH)2) = 98 g/mol
m(Cu(OH)2) =n*M = 0.375 * 98 = 36.75 g
ответ 36.75 г
Объяснение:
NaCl, KNO3, SiO2, I2, алмаз, нифталин