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nS=mS/MS=3,2/32=0,1(mol)
nO2=VO2/22,4=32/22,4=1,42(mol)
PTHH: S + O2 --> SO2 (1)
BĐ: 0,1 1,42
PỨ: 0,1-->0,1-->0,1
SPỨ: 0--->1,32-->0,1
a) Từ PT(1)=>O2 dư
VO2(dư)=nO2(dư) .22,4=1,32 .22,4=29,568(l)
b) Từ PT(1)=>nSO2=0,1(mol)
=>mSO2=n.M=0,1 .64=6,4(g)
Mình sửa lại nha mình nhầm ạ
\(n_S=\dfrac{6,4}{32}=0,2mol\)
\(n_{O_2}=\dfrac{16}{32}=0,5mol\)
\(S+O_2\underrightarrow{t^o}SO_2\)
0,2 0,5 0,2
Sau phản ứng oxi còn dư và dư \(0,5-0,2=0,3mol\)
Oxit axit được tạo thành là \(SO_2\) và có khối lượng:
\(m_{SO_2}=0,2\cdot64=12,8g\)
a, \(n_S=\dfrac{6,4}{32}=0,2\left(mol\right)\)
PTHH: S + O2 ----to----> SO2
Mol: 0,2 0,2 0,2
b, \(m_{SO_2}=0,2.64=12,8\left(g\right)\)
c, \(V_{O_2}=0,2.22,4=4,48\left(l\right)\)
Bài 1:
PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
a, Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,1}{3}< \dfrac{0,1}{2}\), ta được O2 dư.
Theo PT: \(n_{O_2\left(pư\right)}=\dfrac{2}{3}n_{Fe}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow n_{O_2\left(dư\right)}=0,1-\dfrac{1}{15}=\dfrac{1}{30}\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{O_2\left(dư\right)}=\dfrac{1}{30}.32\approx1,067\left(g\right)\\V_{O_2\left(dư\right)}=\dfrac{1}{30}.2,24\approx0,746\left(l\right)\end{matrix}\right.\)
b, Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{1}{30}\left(mol\right)\)
\(\Rightarrow m_{Fe_3O_4}=\dfrac{1}{30}.232\approx7,733\left(g\right)\)
Bài 2:
PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
a, Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{Fe_3O_4}=\dfrac{1}{15}.232\approx15,467\left(g\right)\)
b, Theo PT: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{2}{15}\left(mol\right)\)
\(\Rightarrow V_{O_2}=\dfrac{2}{15}.22,4\approx2,9867\left(l\right)\)
c, PT: \(2N_2+5O_2\underrightarrow{t^o}2N_2O_5\)
Ta có: \(n_{N_2}=\dfrac{2,8}{28}=0,1\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,1}{2}>\dfrac{\dfrac{2}{15}}{5}\), ta được N2 dư.
Theo PT: \(n_{N_2O_5}=\dfrac{2}{5}n_{O_2}=\dfrac{4}{75}\left(mol\right)\)
\(\Rightarrow m_{N_2O_5}=\dfrac{4}{75}.108=5,76\left(g\right)\)
Bạn tham khảo nhé!
Bài 1 :
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(n_{O_2}=\dfrac{2.24}{224}=0.1\left(mol\right)\)
\(3Fe+2O_2\underrightarrow{t^0}Fe_3O_4\)
\(Bđ:0.1......0.1\)
\(Pư:0.1.......\dfrac{1}{15}...\dfrac{1}{30}\)
\(Kt:0........\dfrac{1}{30}....\dfrac{1}{30}\)
\(V_{O_2\left(dư\right)}=\dfrac{1}{30}\cdot22.4=0.747\left(l\right)\)
\(m_{Fe_3O_4}=\dfrac{1}{30}\cdot232=7.73\left(g\right)\)
Bài 2 :
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(3Fe+2O_2\underrightarrow{t^0}Fe_3O_4\)
\(0.2.......0.3.......\dfrac{1}{15}\)
\(V_{O_2}=0.3\cdot22.4=6.72\left(l\right)\)
\(m_{Fe_3O_4}=\dfrac{1}{15}\cdot232=15.47\left(g\right)\)
\(n_{N_2}=\dfrac{2.8}{28}=0.1\left(mol\right)\)
\(2N_2+5O_2\underrightarrow{t^0}2N_2O_5\)
\(0.12......0.3........0.12\)
\(m_{N_2O_5}=0.12\cdot108=12.96\left(g\right)\)
nS = 6,4/32 = 0,2 (mol)
nO2 = 2,24/22,4 = 0,1 (mol)
PTHH: S + O2 -> (t°) SO2
LTL: 0,2 > 0,1 => S dư
nS (p/ư) = nSO2 = nO2 = 0,1 (mol)
=> VSO2 = 0,1 . 22,4 = 2,24 (l)
=> mS (dư) = (0,2 - 0,1) . 32 = 3,2 (g)
nP = 6.2/31 = 0.2 (mol)
nO2 = 6.72/22.4 = 0.3 (mol)
4P + 5O2 -to-> 2P2O5
0.2___0.25_____0.1
mO2 dư = ( 0.3 - 0.25) * 32 = 1.6(g)
mP2O5 = 0.1*142 = 14.2 (g)
Ta có: \(n_P=\dfrac{6.2}{31}=0.29mol\)
\(n_{O_2}=\dfrac{6.72}{22.4}=0.3mol\)
PTHH:
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
ta có:
\(\left\{{}\begin{matrix}\dfrac{n_{P\left(bra\right)}}{nP_{\left(pthh\right)}}=\dfrac{0.2}{4}=0.05\\\dfrac{n_{O_2\left(bra\right)}}{n_{O_2}\left(pthh\right)}=\dfrac{0.3}{5}=0.06\end{matrix}\right.\)
=> \(O_2\) dư
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
4 ----------->2
0.2---------->0.1=nP2O5
=>\(m_{P_2O_5}=142.0.1=14.2\left(g\right)\)
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
\(nO_{2\left(dư\right)}=0,1\left(mol\right)\)
\(mO_{2\left(dư\right)}=0,1.32=3,2\left(g\right)\)
\(nSO_2=nS=0,2\left(mol\right)\)
\(mSO_2=0,2.64=12,8\left(g\right)\)
\(n_S=\dfrac{3.2}{32}=0.1\left(mol\right)\)
\(n_{O_2}=\dfrac{2.688}{22.4}=0.12\left(mol\right)\)
\(S+O_2\underrightarrow{t^0}SO_2\)
\(0.1...0.1.....01\)
\(V_{O_2\left(dư\right)}=\left(0.12-0.1\right)\cdot22.4=0.448\left(l\right)\)
\(V_{SO_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(n_S=\dfrac{3,2}{32}=0,1\left(mol\right)\)
\(n_{O_2}=\dfrac{2,688}{22,4}=0,12\left(mol\right)\)
PTHH : \(S+O_2\rightarrow SO_2\)
Ban đầu : 0,1 0,12 (mol)
Phản ứng : 0,1 0,1 0,1 (mol)
Sau phản ứng : 0 0,02 0,1 (mol)
\(m_{O_2}=0,02.32=0,64\left(g\right)\)
\(m_{SO_2}=0,1.64=6,4\left(g\right)\)
\(V_{SO_2}=0,1.22,4=2,24\left(l\right)\)
a) S+O2-->SO2
n S=9,6/32=0,3(mol)
n O2=2,24/22,4=0,1(mol)
n S > n O2
--.>S dư
n S=n O2=0,1(mol)
n S dư=0,3-0,1=0,2(mol)
m S dư=0,2.32=6,4(g)
b) n SO2=n O2=0,1(mol)
m SO2=0,1.64=6,4(g)
\(n_S=\frac{9,6}{32}=0,3\left(mol\right)\)
\(n_{O2}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
a. \(PTHH:S+O_2\rightarrow SO_2\)
Trước____0,3__ 0,1_______
Phản ứng_0,1_0,1___
Sau ____0,2____0_____0,1
\(\Rightarrow\) S dư, mS dư = 0,2.32 = 6,4g
b. \(n_{SO2}=0,1\left(mol\right)\)
\(\Rightarrow m_{SO2}=0,1.64=6,4\left(g\right)\)