a. \(n_{Fe}=0,5.56=28\left(g\right)\)
\(3Fe+2O_2\rightarrow Fe_3O_4\)
\(n_{O2}=\frac{2}{3}n_{Fe}=\frac{2}{3}.0,5=0,333\left(mol\right)\)
\(\Rightarrow V_{O2}=0,333.22,4=7,46\left(l\right)\)
\(4Al+3O_2\rightarrow2Al_2O_3\)
\(n_{O2}=\frac{3}{4}n_{Al}=\frac{3}{4}.1,25=0,9375\left(mol\right)\)
\(\Rightarrow V_{O2}=0,9375.22,4=21\left(l\right)\)
\(2Zn+O_2\rightarrow2ZnO\)
\(n_{O2}=\frac{1}{2}n_{Zn}=\frac{1}{2}.1,5=0,75\left(mol\right)\)
\(\Rightarrow V_{O2}=0,75.22,4=16,8\left(l\right)\)
b. \(n_P=\frac{3,1}{31}=0,1\left(mol\right)\)
\(4P+5O_2\rightarrow2P_2O_5\)
\(n_{O2}=\frac{5}{4}_P=\frac{5}{4}.0,1=0,125\left(mol\right)\)
\(\Rightarrow V_{O2}=0,125.22,4=2,8\left(l\right)\)
\(S+O_2\rightarrow SO_2\)
\(n_S=n_{O2}=\frac{6,4}{32}=0,2\left(mol\right)\)
\(\Rightarrow V_{O2}=0,2.22,4=4,48\left(l\right)\)
\(C+O_2\rightarrow CO_2\)
\(n_C=n_{O2}=\frac{3,6}{12}=0,3\left(mol\right)\)
\(\Rightarrow V_{O2}=0,3.22,4=6,72\left(l\right)\)
c.
\(CH_4+2O_2\rightarrow CO_2+2H_2O\)
\(n_{CH4}=\frac{1,6}{16}=0,1\left(mol\right)\)
\(n_{O2}=2n_{CH4}=0,2\left(mol\right)\)
\(\Rightarrow V_{O2}=0,2.33,4=4,48\left(l\right)\)
\(2CO+O_2\rightarrow2CO_2\)
\(n_{CO}=\frac{2,8}{28}=0,1\left(mol\right)\)
\(\Rightarrow V_{O2}=0,1.22,4=2,24\left(l\right)\)
\(13O_2+2C_4H_{10}\rightarrow10H_2O+8CO_2\)
\(n_{C4H10}=\frac{0,58}{58}=0,01\left(mol\right)\)
\(n_{O2}=\frac{2}{13}n_{C4H10}=\frac{2}{13}.0,01=0,0015\left(mol\right)\)
\(\Rightarrow n_{O2}=0,0015.22,4=0,034\left(l\right)\)
