решение данных задач в фото
1)
дано
m(ppa H2SO4) = 98 g
W(H2SO4) = 10%
m(KOH)-?
m(H2SO4) = 98*10% / 100% = 9.8 g
2KOH+H2SO4-->K2SO4+2H2O
M(H2SO4) = 98 g/mol
n(H2SO4)= m/M = 9.8 / 98 = 0.1 mol
2n(KOH) = n(H2SO4)
n(KOH) = 0.2 mol
M(KOH) = 56 g/mol
m(KOH) = n*M = 0.2 * 56 = 11.2 g
ответ 11.2 г
2)
n(Al) = 0.1 mol
V(CL2)-?
2Al+3CL2-->2AlCL3
2n(Al) = 3n(CL2)
n(CL2) = 3*0,1 / 2 = 0.15 mol
V(CL2) = n(CL2) * Vm = 0.15 * 22.4 = 3.36 L
ответ 3.36 L
решение данных задач в фото
1)
дано
m(ppa H2SO4) = 98 g
W(H2SO4) = 10%
m(KOH)-?
m(H2SO4) = 98*10% / 100% = 9.8 g
2KOH+H2SO4-->K2SO4+2H2O
M(H2SO4) = 98 g/mol
n(H2SO4)= m/M = 9.8 / 98 = 0.1 mol
2n(KOH) = n(H2SO4)
n(KOH) = 0.2 mol
M(KOH) = 56 g/mol
m(KOH) = n*M = 0.2 * 56 = 11.2 g
ответ 11.2 г
2)
дано
n(Al) = 0.1 mol
V(CL2)-?
2Al+3CL2-->2AlCL3
2n(Al) = 3n(CL2)
n(CL2) = 3*0,1 / 2 = 0.15 mol
V(CL2) = n(CL2) * Vm = 0.15 * 22.4 = 3.36 L
ответ 3.36 L