Насчет 2 не уверен, 3 не знаю, а все остальное уверен на 100%.
FeO+H2=Fe+H2O
n(FeO)=5.6/72=0.077
n(FeO)=n(Fe)
m(Fe)=0.077*56=4.356
η=3,5/4.356=0.80357 80.36\%
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Пусть неизвестное вещество - CxHy
x : y =
![\frac{W(C)}{M(C)} : \frac{W(H)}{M(H)}](https://tex.z-dn.net/?f=%20%5Cfrac%7BW%28C%29%7D%7BM%28C%29%7D%20%3A%20%20%5Cfrac%7BW%28H%29%7D%7BM%28H%29%7D%20)
x : y =
![\frac{85.7}{12} : 14. 3](https://tex.z-dn.net/?f=%20%5Cfrac%7B85.7%7D%7B12%7D%20%3A%2014.%203)
x : y = 7.142 : 14.3
x : y = 1 : 2
CxHy - (CH₂)n
M = D * M(H₂) = 21 * 2 = 42
n =
![\frac{M}{M(CH_2)}](https://tex.z-dn.net/?f=%20%5Cfrac%7BM%7D%7BM%28CH_2%29%7D%20)
=
![\frac{42}{14}](https://tex.z-dn.net/?f=%20%5Cfrac%7B42%7D%7B14%7D)
= 3
(CH₂)n - C₃H₆ - пропен