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a)\(n_{KClO_3}=\dfrac{36,75}{122,5}=0,3mol\)
\(2KClO_3\rightarrow2KCl+3O_2\)
0,3 0,3 0,45
\(V_{O_2}=0,45\cdot22,4=10,08l\)
b)\(n_P=\dfrac{9,3}{31}=0,3mol\)
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
0,3 0,45 0
0,3 0,375 0,15
0 0,075 0,15
\(m_{P_2O_5}=0,14\cdot142=19,88g\)
\(a,2Mg+O_2\rightarrow\left(t^o\right)2MgO\\ b,n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\\ n_{MgO}=n_{Mg}=0,4\left(mol\right)\\ n_{O_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ b,x=m_{MgO}=40.0,4=16\left(g\right)\\ V=V_{O_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\uparrow\\ n_{KClO_3}=\dfrac{2}{3}.n_{O_2}=\dfrac{2}{3}.0,2=\dfrac{2}{15}\left(mol\right)\\ \Rightarrow m_{KClO_3}=\dfrac{2}{15}.122,5=\dfrac{49}{3}\left(g\right)\)
a, 2Mg + O2 \(\rightarrow\) 2MgO (bạn thêm to trên cái mũi tên nhé)
b, nMg = \(\dfrac{9,6}{24}\) = 0,4 (mol)
PTPƯ: 2Mg + O2 \(\rightarrow\) 2MgO
2g/mol 1g/mol 2g/mol
\(\Rightarrow\) 0,4 0,2 0,4
VO2 = 0,2 . 22,4 = 4,48l
mMgO = 0,4 . (24 + 16) = 16(g)
a, PTHH: S + O2 -> (t°) SO2
b, nS = 6,4/32 = 0,2 (mol)
nO2 = 6,72/22,4 = 0,3 (mol)
LTL: 0,2 < 0,3 => O2 dư
nO2 (pư) = nSO2 = nS = 0,2 (mol)
mO2 (dư) = (0,3 - 0,2) . 32 = 3,2 (g)
c, mSO2 = 64 . 0,2 = 12,8 (g)
a, \(S+O_2\underrightarrow{t^o}SO_2\)
\(nS=\dfrac{6,4}{32}=0,2\left(mol\right)\)
\(nO_2=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(\dfrac{0,2}{1}< \dfrac{0,3}{1}\) => oxi dư
\(nO_{2\left(dư\right)}=0,1\left(mol\right)\)
\(mO_{2\left(dư\right)}=0,1.32=3,2\left(g\right)\)
\(nSO_2=nS=0,2\left(mol\right)\)
\(mSO_2=0,2.64=12,8\left(g\right)\)
2KClO3-to\xt->2KCl+3O2
0,1------------------0,1
n KClO3=\(\dfrac{12,25}{122,5}\)=0,1 mol
=>m KCl=0,1.74,5=7,45g
H=\(\dfrac{6,8}{7,45}.100\)=91,275%
b)
2KClO3-to\xt->2KCl+3O2
0,2-------------------------0,3 mol
n O2=\(\dfrac{6,72}{22,4}\)=0,3 mol
H=85%
=>m KClO3=0,2.122,5.\(\dfrac{100}{85}\)=28,82g
c)
2KClO3-to\xt->2KCl+3O2
0,2------------------------0,3
n KClO3=\(\dfrac{24,5}{122,5}\)=0,2 mol
H=80%
=>m O2=0,3.32.\(\dfrac{80}{100}\)=10,4g
4P + 5O2 ----> 2P2O5
0,24 -> 0,3 ---> 0,12 (mol)
nP = \(\dfrac{7,44}{31}\)= 0,24 (mol)
VH2 = 0,3 . 22,4 = 6,72 (l)
2KClO3 ---> 2KCl + 3O2
0,2 <------------- 0,3 (mol)
mKClO3 = 0,2 . (39 + 35,5 + 16.3)
= 24,5 (g)
Vui lòng kiểm tra lại kết quả dùm, thank you.
nP = 7,44 : 31 = 0,24 ( mol)
pthh : 4P + 5O2 -t--> 2P2O5
0,24->0,3 (mol)
=> VO2 =0,3 . 22,4 = 6,72 (l)
pthh : 2KClO3 -t--> 2KCl + 3O2
0,2<-------------------0,3 (mol)
=> mKClO3 = 0,2 .122,5 = 24,5 (g)
Bài 1:
a, \(S+O_2\underrightarrow{t^o}SO_2\)
b, Ta có: \(n_S=\dfrac{3,2}{32}=0,1\left(mol\right)\)
Theo PT: \(n_{SO_2}=n_S=0,1\left(mol\right)\Rightarrow m_{SO_2}=0,1.64=6,4\left(g\right)\)
c, \(n_{O_2}=n_S=0,1\left(mol\right)\Rightarrow V_{O_2}=0,1.22,4=2,24\left(l\right)\)
Bài 2:
a, \(2KClO_3\xrightarrow[MnO_2]{^{t^o}}2KCl+3O_2\)
b, Bạn xem lại đề nhé, pư không tạo thành MnO2.
Bài 3:
a, \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
b, \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(n_{Cu}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)
c, \(n_{H_2O}=n_{H_2}=0,1\left(mol\right)\Rightarrow V_{H_2O}=0,1.22,4=2,24\left(l\right)\)
d, \(n_{CuO}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{CuO}=0,1.80=8\left(g\right)\)
mMg = 3.6/24 = 0.15 (mol)
2Mg + O2 -to-> 2MgO
0.15__0.075____0.15
mMgO= 0.15*40 = 6 (g)
VO2 = 0.075*22.4 = 1.68 (l)
2KClO3 -to-> 2KCl + 3O2
0.05_______________0.075
mKClO3 = 0.05*122.5 = 6.125 (g)
PTHH: \(2Mg+O_2\underrightarrow{t^o}2MgO\)
a+b) Ta có: \(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,075\left(mol\right)\\n_{MgO}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,075\cdot22,4=1,68\left(l\right)\\m_{MgO}=0,15\cdot40=6\left(g\right)\end{matrix}\right.\)
c) PTHH: \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\uparrow\)
Theo PTHH: \(n_{KClO_3}=0,05\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=0,05\cdot122,5=6,125\left(g\right)\)
Cảm ơn bạn @anayuiky đã nhắc lỗi sai. Mình sửa lại ý c):
PTHH: \(2KMnO_4\rightarrow^{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
Theo phương trình \(n_{KMnO_4}=n_{O_2}.2=0,25.2=0,5mol\)
\(\rightarrow m_{KMnO_4}=0,5.\left(39+55+16.4\right)=79g\)
a. \(n_{H_2}=\frac{V}{22,4}=\frac{11,2}{22,4}=0,5mol\)
\(n_{O_2}=\frac{V}{22,4}=\frac{10,08}{22,4}=0,45mol\)
PTHH: \(2H_2+O_2\rightarrow^{t^o}2H_2O\)
Ban đầu: 0,5 0,45 mol
Trong pứng: 0,5 0,25 0,5 mol
Sau pứng: 0 0,2 0,5 mol
\(\rightarrow M_{O_2\left(dư\right)}=n.M=0,2.32=6,4g\)
b. Theo phương trình \(n_{H_2O}=n_{H_2}=0,5mol\)
\(\rightarrow m_{H_2O}=n.M=0,5.18=9g\)
c. PTHH: \(2KMnO_4\rightarrow^{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
0,9 0,45 mol
\(\rightarrow n_{KMnO_4}=\frac{2}{1}n_{O_2}=\frac{0,45.2}{1}=0,9mol\)
\(\rightarrow m_{KMnO_4}=n.M=0,9.158=142,2g\)
a)\(2KClO3-->2KCl+3O2\)
\(n_{KCLO3}=\frac{24,5}{122,5}=0,2\left(mol\right)\)
\(n_{O2}=\frac{3}{2}n_{KClO3}=0,3\left(mol\right)\)
\(V_{O2}=0,3.22,4=6,72\left(l\right)\)
b) \(S+O2-->SO2\)
\(n_S=\frac{14,4}{32}=0,45\left(mol\right)\)
\(\Rightarrow Sdư\)
\(n_S=n_{O2}=0,3\left(mol\right)\)
\(n_Sdư=0,4-0,3=0,15\left(mol\right)\)
\(m_Sdư=0,15.32=4,8\left(g\right)\)
a) \(n_{KClO3}=\frac{24,5}{122,5}=0,2\left(mol\right)\)
PTHH: 2KClO3 -to-> 2KCl + 3O2
0,2 --------------------> 0,3 (mol)
=> \(V_{O2}=0,3.22,4=6,72\left(mol\right)\)
b) \(n_S=\frac{14,4}{32}=0,45\left(mol\right)\)
Xét tỉ lệ: \(\frac{0,45}{1}>\frac{0,3}{1}\) => S dư, O2 hết
PTHH: S + O2 --> SO2
0,3 <- 0,3 (mol)
=> \(m_{S\left(dư\right)}=\left(0,45-0,3\right).32=4,8\left(g\right)\)
Pư có xảy ra sự oxi hóa do lưu huỳnh nhận được oxi sau pư