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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, \(n_{CuO}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{CuO}=0,1.80=8\left(g\right)\)
PTHH: \(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\uparrow\)
\(S+O_2\xrightarrow[]{t^o}SO_2\)
Ta có: \(n_{KClO_3}=\dfrac{18,375}{122,5}=0,15\left(mol\right)\) \(\Rightarrow n_{O_2\left(lý.thuyết\right)}=0,225\left(mol\right)\)
\(\Rightarrow n_{O_2\left(thực\right)}=0,225\cdot85\%=0,19125\left(mol\right)=n_S=n_{SO_2}\)
\(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,19125\cdot22,4=4,284\left(l\right)=V_{SO_2}\\m_S=0,19125\cdot32=6,12\left(g\right)\\\end{matrix}\right.\)
a) S + O2 --to--> SO2
b) \(n_{SO_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: S + O2 --to--> SO2
0,5<-0,5<----0,5
=> \(V_{O_2}=0,5.22,4=11,2\left(l\right)\)
c) \(m_S=0,5.32=16\left(g\right)\)
\(a,PTHH:S+O_2\underrightarrow{t^o}SO_2\left(1\right)\)
\(n_S=\dfrac{m}{M}=\dfrac{9,6}{32}=0,3\left(mol\right)\)
\(Theo.PTHH\left(1\right):n_O=n_S=0,3\left(mol\right)\)
\(PTHH:2KClO_3\underrightarrow{t^o}2KCl+3O_2\\ Theo.PTHH\left(2\right):n_{KClO_3}=\dfrac{2}{3}.n_{O_2}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\\ m_{KClO_3}=n.M=0,2.122,5=24,5\left(g\right)\)
\(b,V_{O_2\left(đktc\right)}=n.22,4=0,2.22,4=4,48\left(l\right)\\ \Rightarrow V_{kk\left(đktc\right)}=5.V_{O_2}=5.4,48=22,4\left(l\right)\)
\(n_P=\dfrac{12}{31}mol\)
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(\dfrac{12}{21}\)\(\rightarrow\)\(\dfrac{5}{7}\)
Khối lượng \(KMnO_4\) cần dùng để thu lượng khí trên:
\(2KMnO_4\underrightarrow{t^o}K_2MnO_2+MnO_2+O_2\)
\(\dfrac{10}{7}\) \(\leftarrow\) \(\dfrac{5}{7}\)
\(\Rightarrow m_{KMnO_4}=\dfrac{10}{7}\cdot158=225,71g\)
Nếu không dùng \(KMnO_4\) mà dùng \(KClO_3\) để thu được khí đủ dùng trên:
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(\dfrac{10}{21}\) \(\leftarrow\) \(\dfrac{5}{7}\)
\(m_{KClO_3}=\dfrac{10}{21}\cdot122,5=58,33g\)
\(a.\)
\(n_{KClO_3}=\dfrac{3.675}{122.5}=0.03\left(mol\right)\)
\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)
\(0.03........................0.045\)
\(V_{O_2}=0.045\cdot22.4=1.008\left(l\right)\)
\(n_{O_2}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)
\(\Rightarrow n_{KClO_3}=\dfrac{0.5\cdot2}{3}=\dfrac{1}{3}mol\)
\(\Rightarrow m_{KClO_3}=\dfrac{1}{3}\cdot122.5=40.83\left(g\right)\)
mS= 14,4/32=0,45(mol)
S + O2 -to-> SO2
0,45_0,45(mol)
2 KClO3 -to-> 2 KCl + 3 O2
0,3<--------------------0,45(mol)
nO2=nS=0,45(mol)
nKClO3= 2/3 . nO2=2/3 . 0,45=0,3(mol)
=> mKClO3= 122,5. 0,3= 36,75(g)
\(n_S=\dfrac{14,4}{32}=0,45\left(mol\right)\)
PTHH : \(S+O_2\rightarrow SO_2\)
0,45 0,45 (mol)
PTHH : \(2KClO_3\rightarrow2KCl+3O_2\)
0,3 0,45 (mol)
\(m_{KClO_3}=0,3.122,5=36,75\left(g\right)\)