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Ta có : nCao = 112/56 = 2 (mol)
cao + 2hno3 ⇒ ca(no3)2 + h2o
2.........4.................2.............2 ( mol)
có số mol rồi bạn tự tính tiếp khối lượng nhé m = n . M
\(n_{Mg}=\dfrac{1,2}{24}=0,05\left(mol\right)\\
pthh:Mg+2HCl\rightarrow MgCl_2+H_2\)
0,05 0,05
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
\(LTL:0,1>0,05\)
=> CuO dư
theo pthh: \(n_{CuO\left(p\text{ư}\right)}=n_{Cu}=n_{H_2}=0,05\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,05.64=3,2\left(g\right)\)
\(\Rightarrow m_{CuO\left(d\right)}=\left(0,1-0,05\right).80=4\left(g\right)\)
1) PTK \(Fe_2\left(SO_4\right)_x=400\) đvC
\(\Rightarrow2.56+96.x=400\)
\(\Rightarrow x=3\)
2) PTK \(Fe_xO_3=160\) dvC
\(\Rightarrow56x+16.3=160\)
\(\Rightarrow x=2\)
\(a) 2Mg + O_2 \xrightarrow{t^o} 2MgO\\ b) 4P + 5O_2 \xrightarrow{t^o} 2P_2O_5\\ c) 2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2\\ d) C_4H_{10} + \dfrac{13}{2}O_2 \xrightarrow{t^o} 4CO_2 + 5H_2O\\ e) 3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\\ g) 2KClO_3 \xrightarrow{^o} 2KCl + 3O_2\)
a) \(2Mg+O_2-^{t^o}\rightarrow2MgO\)
b)\(4P+5O_2-^{t^o}\rightarrow2P_2O_5\)
c)\(2KMnO_4-^{t^o}\rightarrow K_2MnO_4+MnO_2+O_2\)
\(a,C_{M\left(HCl\right)}=\dfrac{0,15}{0,1}=1,5M\\ b,C_{M\left(FeCl_3\right)}=\dfrac{0,3}{0,6}=0,5M\\ c,n_{KOH}=\dfrac{6}{56}=\dfrac{3}{28}\left(mol\right)\\ C_{M\left(KOH\right)}=\dfrac{\dfrac{3}{28}}{0,6}=0,1786M\\ d,n_{H_2SO_4}=\dfrac{29,4}{98}=0,4\left(mol\right)\\ C_{M\left(H_2SO_4\right)}=\dfrac{0,4}{0,2}=2M\)
Bài 15:
PTHH: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
a+b) Ta có: \(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Fe}=0,3\left(mol\right)\\n_{Fe_3O_4}=0,1\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe}=0,3\cdot56=16,8\left(g\right)\\m_{Fe_3O_4}=0,1\cdot232=23,2\left(g\right)\end{matrix}\right.\)
c) PTHH: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
Theo PTHH: \(n_{KMnO_4}=2n_{O_2}=0,4\left(mol\right)\)
\(\Rightarrow m_{KMnO_4}=0,4\cdot158=63,2\left(g\right)\)
Bài 6:
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
a) Ta có: \(\left\{{}\begin{matrix}n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\n_{HCl}=\dfrac{36,5}{36,5}=1\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{1}{2}\) \(\Rightarrow\) Fe p/ứ hết, HCl còn dư
\(\Rightarrow n_{HCl\left(dư\right)}=1-0,2=0,8\left(mol\right)\) \(\Rightarrow m_{HCl\left(dư\right)}=0,8\cdot36,5=29,2\left(g\right)\)
b+c) Theo PTHH: \(n_{Fe}=n_{FeCl_2}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{FeCl_2}=0,1\cdot127=12,7\left(g\right)\\V_{H_2}=0,1\cdot22,4=2,24\left(l\right)\end{matrix}\right.\)
CTHH | phân loại | tên |
BaO | oxit | bari oxit |
Fe2O3 | oxit | sắt (III) oxit |
Na2HPO4 | muối | Natri hidrophotphat |
Al(OH)3 | bazo | nhôm hidroxit |
P2O5 | oxit | điphotpho penta oxit |
H3PO4 | axit | axit photphoric |
K2CO3 | muối | Kali cacbonat |
Cu(OH)2 | bazo | đồng (II) hidroxit |
Cu(OH)2 | bazo | đồng(II)oxit |
Zn(NO3)2 | muối | kẽm nitrat |
HBr | axit | axit bromhidric |
FeCl3 | muối | sắt(III) clorua |
a)
$S + O_2 \xrightarrow{t^o} SO_2$
Theo PTHH :
$n_{SO_2} = n_{O_2} = n_S = \dfrac{3,2}{32} = 0,1(mol)$
$V_{SO_2} = 0,1.22,4 = 2,24(lít)$
b)
$m_{O_2} = 0,1.32 = 3,2(gam)$