Tính phân tử khối của Mg(OH)2, Ca(H2PO4)2, Ba3(PO4)2, Al2(SO4)3, Ca(HCO3)2, Fe(NO3)2
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15 tháng 4 2019
“Phân tử khối bằng tổng khối lượng của các nguyên tửu trong phân tử”
A l 2 O 3 (M = 27.2 + 16.3 = 102 đvC )
A l 2 ( S O 4 ) 3 (M = 342 đvC ) F e ( N O 3 ) 3 ( M = 242 đvC )
N a 3 P O 4 (M = 164 đvC ) C a ( H 2 P O 4 ) 2 ( M = 234 đvC )
B a 3 ( P O 4 ) 2 (M = 601 đvC ) Z n S O 4 ( M = 161 đvC )
AgCl (M = 143,5 đvC ) NaBr ( M = 103 đvC )
24 tháng 11 2021
1. \(2Al+3Fe\left(NO_3\right)_2\rightarrow2Al\left(NO_3\right)_3+3Fe\)
2. \(P_2O_5+3Ba\left(OH\right)_2\rightarrow Ba_3\left(PO_4\right)_2+3H_2O\)
3. \(Al\left(OH\right)_3+3HCl\rightarrow AlCl_3+3H_2O\)
4. \(Al_2\left(SO_4\right)_3+3Ca\left(OH\right)_2\rightarrow3CaSO_4+2Al\left(OH\right)_3\)
5. \(Fe_3O_4+8HCl\rightarrow FeCl_2+2FeCl_3+4H_2O\)
6. \(Mg\left(NO_3\right)_2\underrightarrow{t^o}MgO+2NO_2+\dfrac{1}{2}O_2\)
7. \(2xFe+yO_2\underrightarrow{t^o}2Fe_xO_y\)
8. \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
9. \(C_2H_6O+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)
Bạn tham khảo nhé!
HP
24 tháng 11 2021
\(1.Al+Fe\left(NO_3\right)_2--->Al\left(NO_3\right)_2+Fe\)
\(2.P_2O_5+3Ba\left(OH\right)_2--->Ba_3\left(PO_4\right)_2+3H_2O\)
\(3.Al\left(OH\right)_3+3HCl--->AlCl_3+3H_2O\)
\(4.Al_2\left(SO_4\right)_3+3Ca\left(OH\right)_2--->3CaSO_4+2Al\left(OH\right)_3\downarrow\)
\(5.Fe_3O_4+8HCl--->FeCl_2+2FeCl_3+4H_2O\)
\(6.2Mg\left(NO_3\right)_2\overset{t^o}{--->}2MgO+4NO_2+O_2\)
\(7.xFe+\dfrac{y}{2}O_2\overset{t^o}{--->}Fe_xO_y\)
\(8.CH_4+2O_2\overset{t^o}{--->}CO_2+2H_2O\)
\(9.C_2H_6O+3O_2\overset{t^o}{--->}2CO_2+3H_2O\)
26 tháng 10 2021
\(1,\left\{{}\begin{matrix}p=e\\n+p+e=40\\2p-n=12\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2p+n=40\\2p-n=12\end{matrix}\right.\Leftrightarrow n=\dfrac{40-12}{2}=14\)
\(2,PTK_{Al_2O_3}=2\cdot27+16\cdot3=102\left(đvC\right)\\ PTK_{Al_2\left(SO_4\right)_3}=2\cdot27+\left(32+16\cdot4\right)\cdot3=342\left(đvC\right)\\ PTK_{Fe\left(NO_3\right)_3}=56+\left(14+16\cdot3\right)\cdot3=242\left(đvV\right)\\ PTK_{Na_3PO_4}=23\cdot3+31+16\cdot4=164\left(đvC\right)\\ PTK_{Ca\left(H_2PO_4\right)_2}=40+\left(2+31+16\cdot4\right)\cdot2=234\left(đvC\right)\\ PTK_{Ba_3PO_4}=137\cdot3+31+16\cdot4=506\left(đvC\right)\\ PTK_{ZnSO_4}=65+32+16\cdot4=161\left(đvC\right)\\ PTK_{AgCl}=108+35,5=143,5\left(đvC\right)\\ PTK_{NaBr}=23+80=103\left(đvC\right)\)
LL
26 tháng 5 2018
Câu 1:
O: 6 e ngoài cùng
N: 4 e ngoài cùng
K:1 e ngoài cùng
P: 5 e ngoài cùng
Câu 2:
\(PTK_{Al_2O_3}=2.27+16.3=102\left(đVc\right)\)
Al2(SO4)3=27.2+3.(32+16.4)=342(đVc)
\(Fe\left(NO_3\right)_3=56+3.\left(14+16.3\right)=242\left(đVc\right)\)
\(Na_3PO_4=23.3+31+16.4=164\left(đVc\right)\)
\(Ca\left(H_2PO_4\right)_2=40+2.\left(1.2+31+16.4\right)=234\left(đVc\right)\)
\(Ba_3\left(PO_4\right)_2=137.3+2.\left(31+16.4\right)=601\left(đVc\right)\)
\(ZnSO_4=65+32+16.4=161\left(đVc\right)\)
\(AgCl=108+35,5=143,5\left(đVc\right)\)
\(NaBr=23+80=103\left(đVc\right)\)
H
27 tháng 8 2021
$a) CaO + H_2O \to Ca(OH)_2$
$b) NaOH + HCl \to NaCl + H_2O$
$c) Ca(OH)_2 + 2HNO_3 \to Ca(NO_3)_2 + 2H_2O$
$d) AlCl_3 + 3NaOH \to Al(OH)_3 + 3NaCl$
$e) Mg(NO_3)_2 + Ca(OH)_2 \to Ca(NO_3)_2 + Mg(OH)_2$
$f) CuCl_2 + 2KOH \to Cu(OH)_2 + 2KCl$
$g) Fe(OH)_2 + H_2SO_4 \to FeSO_4 + 2H_2O$
$h) 2Fe(OH)_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 6H_2O$
$i) Al_2(SO_4)_3 + 3BaCl_2 \to 3BaSO_4 + 2AlCl_3$
\(PTK_{Mg\left(OH\right)_2}=24+\left(16+1\right).2=58\left(đvC\right)\)
\(PTK_{Ca\left(H_2PO_4\right)_2}=40+\left(1.2+31+16.4\right).2=234\left(đvC\right)\)
\(PTK_{Ba_3\left(PO_4\right)_2}=137.3+\left(31+16.4\right).2=601\left(đvC\right)\)
\(PTK_{Al_2\left(SO_4\right)_3}=27.2+\left(32+16.4\right).3=342\left(đvC\right)\)
\(PTK_{Ca\left(HCO_3\right)_2}=40+\left(1+12+16.3\right).2=162\left(đvC\right)\)
\(PTK_{Fe\left(NO_3\right)_2}=56+\left(14+16.3\right).2=180\left(đvC\right)\)
\(PTK_{Mg\left(OH\right)_2}=24+\left(16+1\right)\cdot2=58\left(đvC\right)\\ PTK_{Ca\left(H_2PO_4\right)_2}=40+\left(2+31+16\cdot4\right)\cdot2=234\left(đvC\right)\\ PTK_{Ba_3\left(PO_4\right)_2}=137\cdot3+\left(31+16\cdot4\right)\cdot2=601\left(đvC\right)\\ PTK_{Al_2\left(SO_4\right)_3}=27\cdot2+\left(32+16\cdot4\right)\cdot3=342\left(đvC\right)\\ PTK_{Ca\left(HCO_3\right)_2}=40+\left(1+12+16\cdot3\right)\cdot2=162\left(đvC\right)\\ PTK_{Fe\left(NO_3\right)_2}=56+\left(14+16\cdot3\right)\cdot2=180\left(đvC\right)\)