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Объяснение:
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Дано:
m(p-pa Ba(OH)2)= 48,5 г
ω(Ва(ОН)2) = 5,3%, или 0,053
V(SO2) = 568,8 мл = 0,5688 л
ω-?
Объяснение:
M(Ba(OH)2) = 171 г/моль
M(SO2) = 64 г/моль
M(BaSO3) = 217 г/моль
m(Ba(OH)2) = 48,5 г*0,053 = 2,5705 г
n(Ba(OH)2) = 2,5705 г/171 г/моль = 0,015 моль
n(SO2) = 0,2688 л/22,4 л/моль = 0,012 моль
m(SO2) = 0.012 моль*64 г/моль = 0,768 г
Ba(OH)2 + SO2 = BaSO3↓ + H2O
Из УХР видно, что n(Ba(OH)2):n(BaSO3) = 1:1. Согласно расчетам по условию задачи n(Ba(OH)2):n(BaSO3) = 0,015:0,012. Ва(ОН)2 взят в избытке. n(BaSO3)=n(SO2) = 0.012 моль
m(BaSO3) = 0.012 моль*217 г/моль = 2,604 г
Масса не прореагировавшего Ва(ОН)2 (Δm(Ba(OH)2):
Δn(Ba(OH)2) = 0,015 моль-0,012 моль = 0,003 моль
Δm(Ba(OH)2) = 0,003 моль*171 г/моль = 0,513 г
m(p-pa) = 48,5 г + 0,768 г - 2,604 г = 46,664 г
ω(Ba(OH)2) = 0,513 г/46,664 г = 0,011, или 1,1%
ответ: 1,1%
