1.
дано
m(ppa NaCL) = 200 g
m(NaCL) = 40 g
W(NaCL) -?
W(NaCL) = m(NaCL) / m(ppa NaCL) * 100% = 40 / 200 * 100% = 20%
ответ 20%
2
m(Fe2O3) = 100 kg
m(C) = 15 kg
m(Fe)-?
M(Fe2O3) = 160 kg/kmol
n(Fe2O3) = m/M = 100 / 160 = 0,625 kmol
M(C) = 12 kg/kmol
n(C) = m/M = 15 / 12 = 1.25 kmol
n(Fe2O3) < n(C)
Fe2O3+3C-->2Fe+3CO
n(Fe2O3) = 2n(Fe)
n(Fe) = 0.625 * 2 / 1 = 1.25 kmol
M(Fe) = 56 kg/kmol
m(Fe) = n*M = 1.25 * 56 = 70 kg
ответ 70 кг
Объяснение:
1.
дано
m(ppa NaCL) = 200 g
m(NaCL) = 40 g
W(NaCL) -?
W(NaCL) = m(NaCL) / m(ppa NaCL) * 100% = 40 / 200 * 100% = 20%
ответ 20%
2
дано
m(Fe2O3) = 100 kg
m(C) = 15 kg
m(Fe)-?
M(Fe2O3) = 160 kg/kmol
n(Fe2O3) = m/M = 100 / 160 = 0,625 kmol
M(C) = 12 kg/kmol
n(C) = m/M = 15 / 12 = 1.25 kmol
n(Fe2O3) < n(C)
Fe2O3+3C-->2Fe+3CO
n(Fe2O3) = 2n(Fe)
n(Fe) = 0.625 * 2 / 1 = 1.25 kmol
M(Fe) = 56 kg/kmol
m(Fe) = n*M = 1.25 * 56 = 70 kg
ответ 70 кг
Объяснение: