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Bài 1:
\(PTHH:2HgO\underrightarrow{Phân.hủy}2Hg+O_2\\ á,Theo.PTHH:n_{O_2}=\dfrac{1}{2}.n_{HgO}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\\ V_{O_2\left(đktc\right)}=n.22,4=0,05.22,4=1,12\left(l\right)\)
\(b,n_{HgO}=\dfrac{m}{M}=\dfrac{43,4}{217}=0,2\left(mol\right)\\ Theo.PTHH:n_{Hg}=n_{HgO}=0,2\left(mol\right)\\ m_{Hg}=n.M=0,2.201=40,2\left(g\right)\)
\(c,n_{Hg}=\dfrac{m}{M}=\dfrac{14,07}{201}=0,07\left(mol\right)\\ Theo.PTHH:n_{HgO}=n_{Hg}=0,07\left(mol\right)\\ m_{HgO}=n.M=0,07.217=15,19\left(g\right)\)
Câu 2:
\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Theo.PTHH:n_{Zn}=n_{H_2}=0,3\left(mol\right)\\ m_{Zn}=n.M=0,3.65=19,5\left(g\right)\\ b,Theo.PTHH:n_{HCl}=2.n_{Zn}=2.0,3=0,6\left(mol\right)\\ m_{HCl}=n.M=0,6.36,5=21,9\left(g\right)\)
2HgO -t--> 2Hg + O2
0,15-------------->0,75 (mol)
=> mO2 = 0,75 . 32 = 24 (g)
nHgO=2,17/217=0,01(mol)
nO2=0,112/22,4=0,005(mol)
PTHH: 2 Hg + O2 -to-> 2 HgO
Ta có: 0,01/2 = 0,005
=>P.ứ xảy ra hết.
=> nHg=nHgO=0,01(mol)
=>mHg=0,01.201=2,01(g)
2HgO---->2Hg+O2
a) n O2=1/2n HgO=4(mol)
m O2=4.32=128(g)
b) n HgO=434/217=2(mol)
Theo pthh
n Hg=n HgO=2(mol)
m Hg=2.201=402(g)
c) n Hg=150,75/201=0,75(mol)
Theo pthh
n HgO=n Hg=0,75(mol)
m HgO=0,75.217=162,75(g)
a) 2Na + 2H2O --> 2NaOH + H2 (pư thế)
b) K2O + H2O --> 2KOH (pư hóa hợp)
c) Fe + CuSO4 --> FeSO4 + Cu (pư thế)
d) 2HgO --to--> 2Hg + O2 (pư phân hủy)
\(2Na+2H_2O\rightarrow2NaOH+H_2\)
\(K_2O+H_2O\rightarrow2KOH\Rightarrow\)Phản ứng hóa hợp.
\(Fe+CuSO_4\rightarrow FeSO_4+Cu\Rightarrow\)Phản ứng thế.
\(2HgO\underrightarrow{t^o}2Hg+O_2\)\(\Rightarrow\)Phản ứng phân hủy
2.
a) 2Na + O2 -> 2NaO
b) P2O5 + 3H2O -> 2H3PO4
c) HgO -> Hg + 1/2O2
d) 2Fe(OH)3 -> Fe2O3 + 3H2O
e) Na2CO3 + CaCl2 -> CaCO3 + 2NaCl
PT: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
Ta có: \(n_{KMnO_4}=\dfrac{79}{158}=0,5\left(mol\right)\)
a, Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{KMnO_4}=0,25\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,25.22,4=5,6\left(l\right)\)
b, Theo PT: \(n_{K_2MnO_4}=n_{MnO_2}=\dfrac{1}{2}n_{KMnO_4}=0,25\left(mol\right)\)
\(\Rightarrow m_{K_2MnO_4}=0,25.197=49,25\left(g\right)\)
\(m_{MnO_2}=0,25.87=21,75\left(g\right)\)
c, Phần này bạn bổ sung thêm đề nhé!
PTHH: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
a) Ta có: \(n_{KMnO_4}=\dfrac{79}{158}=0,5\left(mol\right)\)
\(\Rightarrow n_{O_2}=0,25mol\) \(\Rightarrow V_{O_2}=0,25\cdot22,4=5,6\left(l\right)\)
b) Theo PTHH: \(n_{K_2MnO_4}=n_{MnO_2}=0,25mol\)
\(\Rightarrow\left\{{}\begin{matrix}m_{K_2MnO_4}=0,25\cdot197=49,25\left(g\right)\\m_{MnO_2}=0,25\cdot87=21,75\left(g\right)\end{matrix}\right.\)
c) Bạn xem lại đề !!
a) 2HgO → 2Hg +O\(_2\)
b) Theo PT ta có: n\(_{O_2}\)=\(\dfrac{1}{2}\)nHgO=\(\dfrac{1}{2}\).0,1=0,05(mol)⇒m\(_{O_2}\)=0,05.32=1,6(g)
c)nHgO=\(\dfrac{43,4}{217}\)=0,2(mol)
Theo Pt ta có:nHg=nHgO=0,2(mol)⇒mHg=0,2.201=40,2(g)
a, PTHH:2HgO--->2Hg+O2
b, Theo pt: nO2=\(\dfrac{1}{2}.nHgO=\dfrac{1}{2}.0,1=0,05\) mol
=> mO2= 0,05.32= 1,6 (g)
c, nHgO=\(\dfrac{43,4}{217}=0,2\) mol
Theo pt: nHg=nHgO=0,2 mol
=> mHg= 0,2.201= 40,2 (g)