1.
дано
m(BaSO4) = 2.33 g
m(BaCL2) -?
m(H2SO4)-?
BaCL2 + H2SO4-->BaSO4+2HCL
M(BaSO4) = 233 g/mol
n(BaSO4) = m/M = 2.33 / 233 = 0.01 mol
n(BaCL2) = n(H2SO4) = n(BaSO4) = 0.01 mol
M(BaCL2) = 208 g/mol
m(BaCL2) = n*M = 0.01 * 208 = 2.08 g
M(H2SO4) = 98 g/mol
m(H2SO4) = n*M = 0.01 * 98 = 0.98 g
ответ 2.08 g , 0.98 g
2)
дано
m(Fe(OH)3) = 2.14 g
m(FeCL3) -?
m(NaOH)-?
FeCL3+ 3NaOH-->3NaCL+Fe(OH)3
M(Fe(OH)3) = 107 g/mol
n(Fe(OH)3) = m/M = 2.14 / 107 = 0.02 mol
n(FeCL3) = n(Fe(OH)3) = 0.02 mol
M(FeCL3) = 162.5 g/mol
m(FeCL3) = n*M = 0.02 * 162.5 = 3.25 g
3n(NaOH) = n(Fe(OH)3)
n(NaOH) = 3* 0.02 = 0.06 mol
M(NaOH) = 40 g/mol
m(NaOH) = n*M = 0.06 * 40 = 2.4 g
ответ 3.25 г, 2.4 г
Объяснение:
Б. Fe + CuSO4 = Cu + FeSO4
В. 3Zn + 2FeBr3 = 3ZnBr2 +2Fe
E. S + 2KNO3 = SO2 + 2KNO2