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Sửa câu 1: \(Fe_2(SO_4)_x\)
\(1,PTK_{Fe_2(SO_4)_x}=56.2+(32+16.4)x=400\\ \Rightarrow 96x=288\\ \Rightarrow x=3\\ \Rightarrow Fe_2(SO_4)_3\\ 2,PTK_{Fe_xO_3}=56x+16.3=160\\ \Rightarrow 56x=112\\ \Rightarrow x=2\\ \Rightarrow Fe_2O_3\)
\(M_{Fe_2\left(SO_4\right)_x}=56\cdot2+96x=400\left(đvc\right)\\ \Leftrightarrow x=3\)
\(\Rightarrow Fe_2\left(SO_4\right)_3\)
\(M_{Fe_xO_3}=56x+16\cdot3=160\left(đvc\right)\\ \Leftrightarrow x=2\)
\(\Rightarrow Fe_2O_3\)
\(M_{K_xSO_4}=39x+32+64=174\left(đvc\right)\Leftrightarrow x=2\)
\(\Rightarrow K_2SO_4\)
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) \(PTK_{h/c}=x.NTK_K+NTK_S+4.NTK_O=174\)
\(\Rightarrow x.39+32+4.16=174\)
\(\Rightarrow39x=174-32-4.16=78\)
\(\Rightarrow x=2\)
Có \(PTK_{Al_2\left(SO_4\right)_x}=342đvC\)
\(\rightarrow27.2+\left(32+16.4\right).x=342\)
\(\rightarrow54+96x=342\)
\(\rightarrow x=3\)
1.\(a.CTHH:Fe_2\left(SO_4\right)_x\\ Tacó:56.2+\left(32+16.4\right).x=400\\ \Rightarrow x=3\\ VậyCTHH:Fe_2\left(SO_4\right)_3\\ b.CTHH:Fe_xO_3\\ Tacó:56.x+16.3=160\\ \Rightarrow x=2\\ VậyCTHH:Fe_2O_3\)
2. \(M_{Cu}=64\left(g/mol\right)\\ M_{H_2O}=2+16=18\left(g/mol\right)\\ M_{CO_2}=14+16.2=44\left(g/mol\right)\\ M_{CuO}=64+16=80\left(g/mol\right)\\ M_{HNO_3}=1+14+16.3=63\left(g/mol\right)\\ M_{CuSO_4}=64+32+16.4=160\left(g/mol\right)\\ M_{Al_2\left(SO_4\right)_3}=27.2+\left(32+16.4\right).3=342\left(g/mol\right)\)
1.
\(PTK_{CuSO_4}=64+32+16.4=160\left(đvC\right)\)
\(PTK_{5CaCO_3}=5\left(40+12+16.3\right)=500\left(đvC\right)\)
\(PTK_{Ca\left(OH\right)_2}=40+\left(16+1\right).2=74\left(đvC\right)\)
2.
Theo đề, ta có:
\(d_{\dfrac{X}{Mg}}=\dfrac{M_X}{M_{Mg}}=\dfrac{M_X}{24}=\dfrac{4}{3}\left(lần\right)\)
=> MX = 32(g)
Vậy X là lưu huỳnh (S)
3.
Ta có: \(PTK_{Al_x\left(SO_4\right)_3}=27.x+\left(32+16.4\right).3=342\left(đvC\right)\)
=> x = 2
Bài 1.Phân tử khối các chất:
\(CuSO_4\)\(\Rightarrow64+32+4\cdot16=160\left(đvC\right)\)
\(CaCO_3\Rightarrow40+12+3\cdot16=100\left(đvC\right)\)
\(Ca\left(OH\right)_2\Rightarrow40+16\cdot2+2=74\left(đvC\right)\)
Bài 2.Theo bài: \(\overline{M_X}=\dfrac{4}{3}\overline{M_{Mg}}=\dfrac{4}{3}\cdot24=32\left(đvC\right)\)
Vậy X là lưu huỳnh.KHHH: S.
Bài 3. \(Al_x\left(SO_4\right)_3\) \(\Rightarrow27x+3\cdot\left(32+4\cdot16\right)=342\Leftrightarrow x=2\)
\(\Rightarrow27x+\left(32+16\cdot4\right)\cdot3=342\\ \Rightarrow27x+288=342\\ \Rightarrow x=2\)
1. Ta có: 56 x 2 + ( 32 + 16 x 4 )x = 400
=> x = 3
=> CTHH: Fe2(SO4)3
2. Cách giải tương tự 1
=> CTHH: Al2(SO4)3
3. Cách giải tương tự 1
=> CTHH: K2SO4