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Gọi \(x,y\) lần lượt là số mol của \(CaO,BaO\)
\(m_{CaO}+m_{BaO}=m_{hh}\\ \rightarrow56x+153y=20,9\left(1\right)\)
\(PTHH:CaO+CO_2\rightarrow CaCO_3\downarrow+H_2O\\ \left(mol\right)--x\rightarrow--x---x---x\\ PTHH:BaO+CO_2\rightarrow BaCO_3\downarrow+H_2O\\ \left(mol\right)--y\rightarrow--y---y---y\)
\(m_{CaCO_3}+m_{BaCO_3}=m_{muối}\\ \rightarrow100x+197y=29,7\left(2\right)\)
Từ (1) và (2) ta có hpt: \(\left\{{}\begin{matrix}56x+153y=20,9\\100x+197y=29,7\end{matrix}\right.\)
\(\leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\\ \rightarrow\left\{{}\begin{matrix}\%m_{CaO}=\dfrac{56.0,1}{20,9}.100\%=26,8\%\\\%m_{BaO}=100\%-26,8\%=73,2\%\end{matrix}\right.\\ \rightarrow V_{CO_2}=\left(x+y\right).22,4=\left(0,1+0,1\right).22,4=4,48\left(l\right)\)
\(n_{MgCO_3}=a\left(mol\right)\)
\(n_{CaCO_3}=b\left(mol\right)\)
\(n_{CO_2}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)
\(MgCO_3\underrightarrow{^{^{t^0}}}MgO+CO_2\)
\(CaCO_3\underrightarrow{^{^{t^0}}}CaO+CO_2\)
\(MgCO_3+2HCl\rightarrow MgCl_2+CO_2+H_2O\)
\(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
\(\left\{{}\begin{matrix}a+b=0.5\\40a+56b=2.2\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=1.6125\\b=-1.1125\end{matrix}\right.\)
Xem lại đề !
a, PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Giả sử: \(\left\{{}\begin{matrix}n_{C_2H_4}=x\left(mol\right)\\n_{C_2H_2}=y\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow x+y=\dfrac{1,344}{22,4}=0,06\left(1\right)\)
Ta có: \(n_{Br_2}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}+2n_{C_2H_2}=x+2y\left(mol\right)\)
⇒ x + 2y = 0,1 (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,02\left(mol\right)\\y=0,04\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,02}{0,06}.100\%\approx33,33\%\\\%\text{ }V_{C_2H_2}\approx66,67\%\end{matrix}\right.\)
b, Ta có: 1/2 hỗn hợp khí gồm: 0,01 mol C2H4 và 0,02 mol C2H2.
PT: \(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)
Theo PT: \(n_{CO_2}=2n_{C_2H_4}+2n_{C_2H_2}=0,06\left(mol\right)\)
\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=0,06\left(mol\right)\)
\(\Rightarrow m_{cr}=m_{CaCO_3}=0,06.100=6\left(g\right)\)
Bạn tham khảo nhé!
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Ta có: \(n_{C_2H_4}+n_{C_2H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\left(1\right)\)
Theo PT: \(n_{Br_2}=n_{C_2H_4}+n_{C_2H_2}=\dfrac{6,4}{160}=0,04\left(mol\right)\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{C_2H_4}=0,01\left(mol\right)\\n_{C_2H_2}=0,015\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,01.22,4}{0,56}.100\%=40\%\\\%V_{C_2H_2}=60\%\end{matrix}\right.\)
\(n_{CO_2}=\dfrac{0,448}{22,4}=0,02(mol)\\ a,CaCO_3+2HCl\to CaCl_2+H_2O+CO_2\uparrow\\ b,n_{CaCO_3}=n_{CO_2}=0,02(mol)\\ \Rightarrow m_{CaCO_3}=0,02.100=2(g)\\ c,\%_{CaCO_3}=\dfrac{2}{5}.100\%=40\%\\ \%_{CaSO_4}=100\%-40\%=60\%\)
bài 1:
\(n_{SO_2}=0,9\left(mol\right)\)
\(4FeS_2+11O_2-t^0->2Fe_2O_3+8SO_2\)
x............................................................2x
\(2ZnS+3O_2-t^0->2ZnO+2SO_2\)
y..........................................................y
\(\left\{{}\begin{matrix}2x+y=0,9\\120x+97y=65\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,3\\y=0,3\end{matrix}\right.\)
\(m_{FeS_2}=0,3.120=36\left(g\right)\)
\(m_{ZnS}=65-36=29\left(g\right)\)
bài 2:
\(n_{CO_2}=0,45\left(mol\right)\)
\(CaCO_3-t^0->CaO+CO_2\)
x..........................x.......................x
\(MgCO_3-t^0->MgO+CO_2\)
y............................y.......................y
\(\left\{{}\begin{matrix}x+y=0,45\\56x+40y=22,8\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,3\\y=0,15\end{matrix}\right.\)
\(m_{CaCO_3}=0,3.100=30\left(g\right)\)
\(m_{MgCO_3}=0,15.84=12,6\left(g\right)\)
\(Gọi : n_{C_2H_4} = a; n_{C_2H_2} = b\\ \Rightarrow a + b = \dfrac{5,6}{22,4} = 0,25(1)\\ C_2H_4 + Br_2 \to C_2H_4Br_2\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ n_{Br_2} = a + 2b = \dfrac{56}{160} =0,35(2)\\ (1)(2)\Rightarrow a = 0,15 ; b = 0,1\\ \Rightarrow \%V_{C_2H_4} = \dfrac{0,15}{0,25} .100\% = 60\%\\ \%V_{C_2H_2} = 100\% -60\% = 40\%\)
Bảo toàn khối lượng => \(m_{CO_2}=29,7-20,9=8,8g\)
\(\Rightarrow V_{CO_2}=\dfrac{8,8}{44}.22,4=4,48\left(l\right)\)
Gọi x,y lần lượt là số mol BaO và CaO ban đầu :
Theo đề ta có hệ : \(\left\{{}\begin{matrix}153x+56y=20,9\\197x+100y=29,7\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{BaO}=0,1.153=15,3\left(g\right)\\m_{CaO}=0,1.56=5,6\left(g\right)\end{matrix}\right.\)
@Thảo Phương cảm ơn bạn