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Bài 2:
a) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
b) Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)=n_{Zn}\)
\(\Rightarrow m_{Zn}=0,2\cdot65=13\left(g\right)\) \(\Rightarrow m_{Cu\left(ko.tan\right)}=19,4-13=6,4\left(g\right)\)
c) Theo PTHH: \(n_{HCl}=2n_{H_2}=0,4\left(mol\right)\) \(\Rightarrow V_{ddHCl}=\dfrac{0,4}{0,6}\approx0,67\left(l\right)=670\left(ml\right)\)
\(a,n_{KMnO_4}=\dfrac{63,2}{158}=0,4\left(mol\right)\\ 2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\uparrow\\ n_{O_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ V_{O_2\left(\text{đ}ktc\right)}=0,2.22,4=4,48\left(l\right)\\ b,n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ 2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\uparrow\\ n_{KClO_3}=\dfrac{2}{3}.0,6=0,4\left(mol\right)\\ m_{KClO_3}=0,4.122,5=49\left(g\right)\)
\(2xR+yO_2\underrightarrow{^{^{t^0}}}2R_xO_y\)
\(2KMnO_4+16HCl_{\left(đ\right)}\underrightarrow{^{^{t^0}}}2KCl+2MnCl_2+5Cl_2+8H_2O\)
\(C_nH_{2n+2}+\dfrac{3n+1}{2}O_2\underrightarrow{^{^{t^0}}}nCO_2+\left(n+1\right)H_2O\)
\(8Al+30HNO_3\rightarrow8Al\left(NO_3\right)_3+3N_2O+15H_2O\)
....
1. a, PTK CO2: 12 + 16 . 2 = 44 (đvC)
b, PTK H2O: 2 + 16 = 18 (đvC)
c, PTK KNO3: 39 + 14 + 16 . 3 = 101 (đvC)
d, PTK Fe2(SO4)3: 56 . 2 + (32 + 16 . 4) . 3 = 400 (đvC)
e, PTK Br2: 80 . 2 = 160 (đvC)
2. a, CuO
b, Al2O3
c, Ba3(PO4)2
3. nFe = 5,6/56 = 0,1 (mol)
nCl2 = 10,65/71 = 0,15 (mol)
PTHH: 2Fe + 3Cl2 -> (t°) 2FeCl3
LTL: 0,1/2 = 0,15/3 => ko có chất dư
nFeCl3 = 0,1 (mol)
mFeCl3 = 0,1 . 162,5 = 16,25 (g)