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\(M_{C_{6}H_{12}O_{6}}:12.6+1.12+16.6=180(đvc)\\ M_{Na_2CO_3}=23.2+12+16.3=106(đvc)\)
Đơn chất: \(O_2\)
Hợp chất là những cái còn lại
\(M_{O_2}=32\)
\(M_{CO}=24+16=40\)
Đơn chất là : O2 ----> PTK : 16.2= 32 DvC
Hợp chất là : CO , SO2, Fe2( SO4)3 , Al(OH)3
\(M_{CO}=12+16=28\left(DvC\right)\\ M_{SO_2}=32+16.2=64\left(DvC\right)\\ M_{Fe_2\left(SO_4\right)_3}=56.2+\left(32+16.4\right).3=112+\left(32+64\right).3=400\left(DvC\right)\\ M_{Al\left(OH\right)_3}=27+\left(16+1\right).3=78\left(DvC\right)\)
\(M_{Fe_2\left(SO_4\right)_x}=56\cdot2+96x=400\left(đvc\right)\\ \Leftrightarrow x=3\)
\(\Rightarrow Fe_2\left(SO_4\right)_3\)
\(M_{Fe_xO_3}=56x+16\cdot3=160\left(đvc\right)\\ \Leftrightarrow x=2\)
\(\Rightarrow Fe_2O_3\)
\(M_{K_xSO_4}=39x+32+64=174\left(đvc\right)\Leftrightarrow x=2\)
\(\Rightarrow K_2SO_4\)
a) \(Fe_2\left(SO_4\right)_x\)
\(PTK_{h/c}=2.NTK_{Fe}+x.\left(PTK_{SO_4}\right)=400\)
\(\Rightarrow2.56+x.96=400\)
\(\Rightarrow96x=400-2.56=288\)
\(\Rightarrow x=288:96=3\)
b) \(PTK_{h/c}=x.NTK_{Fe}+3.NTK_O=160\)
\(\Rightarrow x.56+3.16=160\)
\(\Rightarrow56x=160-3.16=112\)
\(\Rightarrow x=2\)
c) \(PTK_{h/c}=x.NTK_K+NTK_S+4.NTK_O=174\)
\(\Rightarrow x.39+32+4.16=174\)
\(\Rightarrow39x=174-32-4.16=78\)
\(\Rightarrow x=2\)
nS = 8/32 = 0,25 (mol)
nFe2(SO4)3 = 0,25/3 = 1/12 (mol)
=> nO2 = 1/12 (mol)
PTHH: 2KMnO4 -> (t°) K2MnO4 + MnO2 + O2
nKMnO4 = 1/12 . 2 = 1/6 (mol)
mKMnO4 = 1/6 . 158 = 79/3 (g)
\(PTK_{KMnO_4}=1K+1Mn+4O=39.1+55.1+16.4=158\left(đvC\right)\\ PTK_{Fe_2\left(SO_4\right)_3}=2Fe+3\left(SO_4\right)=56.2+3\left(32+16.4\right)=400\left(đvC\right)\\ PTK_{NO_2}=1N+2O=14.1+16.2=46\left(đvC\right)\)
\(PTK_{Mg\left(OH\right)_2}=1Mg+2OH=1.24+2.16+2.1=58\left(đvC\right)\\ PTK_{C_{12}H_{22}O_{11}}=12C+22H+11O=12.12+22.1+16.11=342\left(đvC\right)\)
\(M_{Al_2O_3}=27\cdot2+16\cdot3=102\left(g\text{/}mol\right)\)
\(M_{Fe_2\left(SO_4\right)_3}=56\cdot2+\left(31+16\cdot4\right)\cdot3=400\left(g\text{/}mol\right)\)
\(M_{NaOH}=23+16+1=40\left(g\text{/mol}\right)\)
\(M_{C_{12}H_{22}O_{11}}=12\cdot12+22+16\cdot11=342\left(g\text{/}mol\right)\)
Fe2(CO3)3 có phân tử khối là: 56*2+(12+16*3)*3 = 112+60*3 = 112+180 = 292 ĐvC
HT~~~~~~~~