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\(a,n_{KMnO_4}=\dfrac{63,2}{158}=0,4\left(mol\right)\\ 2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\uparrow\\ n_{O_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ V_{O_2\left(\text{đ}ktc\right)}=0,2.22,4=4,48\left(l\right)\\ b,n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ 2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\uparrow\\ n_{KClO_3}=\dfrac{2}{3}.0,6=0,4\left(mol\right)\\ m_{KClO_3}=0,4.122,5=49\left(g\right)\)
\(2xR+yO_2\underrightarrow{^{^{t^0}}}2R_xO_y\)
\(2KMnO_4+16HCl_{\left(đ\right)}\underrightarrow{^{^{t^0}}}2KCl+2MnCl_2+5Cl_2+8H_2O\)
\(C_nH_{2n+2}+\dfrac{3n+1}{2}O_2\underrightarrow{^{^{t^0}}}nCO_2+\left(n+1\right)H_2O\)
\(8Al+30HNO_3\rightarrow8Al\left(NO_3\right)_3+3N_2O+15H_2O\)
\(1.a.2Mg+O_2-^{t^o}\rightarrow2MgO\\ b.Fe+2AgNO_3\rightarrow Fe\left(NO_3\right)_2+2Ag\\ c.C_2H_4+3O_2-^{t^o}\rightarrow2CO_2+2H_2O\\ d.CuO+2HCl\rightarrow CuCl_2+H_2O\\ e.2Na+2H_2O\rightarrow2NaOH+H_2\\ f.4Al+3O_2-^{t^o}\rightarrow2Al_2O_3\)
\(2.a.Magie+Axitclohidric\rightarrow MagieClorua+Hidro\\ b.Mg+2HCl\rightarrow MgCl_2+H_2\\ c.m_{Mg}+m_{HCl}=m_{MgCl_2}+m_{H_2}\\ d.m_{HCl}=m_{MgCl_2}+m_{H_2}-m_{Mg}=47,5+1-12=36,5\left(g\right)\)
Câu 5 :
a)
$n_{NaOH} = 0,1.2,5 = 0,25(mol)$
$m_{NaOH} = 0,25.40 = 10(gam)$
b)
$C_{M_{CaCl_2}} = \dfrac{0,02}{0,2} = 0,1M$
c)
$C\%_{NaCl} = \dfrac{6}{6 + 144}.100\% = 4\%$
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
\(FeO+H_2\xrightarrow[]{t^o}Fe+H_2O\)
Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)=n_{H_2}=n_{Fe}\) \(\Rightarrow m_{Fe}=0,1\cdot56=5,6\left(g\right)\)