\(a/n_{Fe}=\dfrac{16,8}{56}=0,3mol\\ 4Fe+3O_2\xrightarrow[]{t^0}2Fe_2O_3\\ n_{O_2}=\dfrac{0,3.3}{4}=0,225mol\\ V_{O_2,đktc}=0,225.22,4=5,04l\\ V_{O_2,đkc}=0,225.24,79=5,57775l\\ b/n_{Fe_2O_3}=\dfrac{0,3.2}{4}=0,15mol\\ m_{Fe_2O_3}=0,15.160=24g\)
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