дано
a)
n(S) = 1 mol
n(H2) = 0.5 mol
N-?
N(S) = n(S) * N(A) = 1*6.02*10^23 = 6.02*10^23 атомов
N(H2) =n(H2)*N(A)*n = 0.5*6.02*10^23 *2 = 6.02*10^23 атомов
N(S) = N(H2)
b)
дано
n(С) = 1 mol
m(C) = 12 g
N-?
N(C) = n(C) * N(A) = 1*6.02*10^23 = 6.02*10^23 атомов
N(C) = m(C) / M(C) * N(A) = 12 / 12 *6.02*10^23 = 6.02*10^23 атомов
N(C) = N(C)
c)
дано
m(Fe) = 56 g
n(O2) = 2 mol
N-?
N(Fe) = m(Fe) / M(Fe) * N(A) = 56 / 56*6.02*10^23 = 6.02*10^23 атомов
N(O2) = n(O2) * N(A) = 2 *6.02*10^23 = 12.04*10^23 атомов
N(Fe) < N(O2)
1) 2Mg + O2 = 2MgO
2) MgO + H2O = Mg(OH)2
3) Mg(OH)2 + Zn(NO3)2 = Zn(OH)2 + Mg(NO3)2
4) 2Mg(NO3)2 + t = 2MgO + 4NO2 + 02