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Bạn lập các PTHH sau đó chuyển tất cả thành số mol.Tính số mol của Oxi theo các chất đã cho
a. \(n_{Fe}=0,5.56=28\left(g\right)\)
\(3Fe+2O_2\rightarrow Fe_3O_4\)
\(n_{O2}=\frac{2}{3}n_{Fe}=\frac{2}{3}.0,5=0,333\left(mol\right)\)
\(\Rightarrow V_{O2}=0,333.22,4=7,46\left(l\right)\)
\(4Al+3O_2\rightarrow2Al_2O_3\)
\(n_{O2}=\frac{3}{4}n_{Al}=\frac{3}{4}.1,25=0,9375\left(mol\right)\)
\(\Rightarrow V_{O2}=0,9375.22,4=21\left(l\right)\)
\(2Zn+O_2\rightarrow2ZnO\)
\(n_{O2}=\frac{1}{2}n_{Zn}=\frac{1}{2}.1,5=0,75\left(mol\right)\)
\(\Rightarrow V_{O2}=0,75.22,4=16,8\left(l\right)\)
b. \(n_P=\frac{3,1}{31}=0,1\left(mol\right)\)
\(4P+5O_2\rightarrow2P_2O_5\)
\(n_{O2}=\frac{5}{4}_P=\frac{5}{4}.0,1=0,125\left(mol\right)\)
\(\Rightarrow V_{O2}=0,125.22,4=2,8\left(l\right)\)
\(S+O_2\rightarrow SO_2\)
\(n_S=n_{O2}=\frac{6,4}{32}=0,2\left(mol\right)\)
\(\Rightarrow V_{O2}=0,2.22,4=4,48\left(l\right)\)
\(C+O_2\rightarrow CO_2\)
\(n_C=n_{O2}=\frac{3,6}{12}=0,3\left(mol\right)\)
\(\Rightarrow V_{O2}=0,3.22,4=6,72\left(l\right)\)
c.
\(CH_4+2O_2\rightarrow CO_2+2H_2O\)
\(n_{CH4}=\frac{1,6}{16}=0,1\left(mol\right)\)
\(n_{O2}=2n_{CH4}=0,2\left(mol\right)\)
\(\Rightarrow V_{O2}=0,2.33,4=4,48\left(l\right)\)
\(2CO+O_2\rightarrow2CO_2\)
\(n_{CO}=\frac{2,8}{28}=0,1\left(mol\right)\)
\(\Rightarrow V_{O2}=0,1.22,4=2,24\left(l\right)\)
\(13O_2+2C_4H_{10}\rightarrow10H_2O+8CO_2\)
\(n_{C4H10}=\frac{0,58}{58}=0,01\left(mol\right)\)
\(n_{O2}=\frac{2}{13}n_{C4H10}=\frac{2}{13}.0,01=0,0015\left(mol\right)\)
\(\Rightarrow n_{O2}=0,0015.22,4=0,034\left(l\right)\)
a) PTHH :
2KClO3 \(\rightarrow\)2KCl + 3O2 (1)
CH4 + 2O2 \(\rightarrow\)CO2 + 2H2O (2)
2H2 + O2 \(\rightarrow\) 2H2O (3)
Theo PT(2) => nO2 = 2.nCH4 = 2 x 0.5 =1(mol)
Theo PT(3) => nO2 = 1/2 x nH2 = 1/2 x 0.25 =0.125(mol)
=> tổng nO2 = 1+ 0.125 =1.125(mol)
Theo PT(1) => nKClO3 = 2/3 . nO2 = 2/3 x 1.125 = 0.75(mol)
=> mKClO3 = n .M = 0.75 x 122.5 =91.875(g)
b) 4Al + 3O2 \(\rightarrow\) 2Al2O3 (4)
2Zn + O2 \(\rightarrow\) 2ZnO (5)
nAl = m : M = 6.75/27=0.25(mol)
nZn = m/M = 9.75/65 =0.15(mol)
Theo PT(4) => nO2 = 3/4 . nAl = 3/4 x 0.25 =0.1875(mol)
Theo PT(5) => nO2 = 1/2 x nZn = 1/2 x 0.15 =0.075(mol)
tổng nO2 = 0.1875 + 0.075 =0.2625(mol)
theo PT(1) => nKClO3 = 2/3 x nO2 = 2/3 x 0.2625 =0.175(mol)
=> mKClO3 = n .M = 0.175 x 122.5 =21.4375(g)
a, \(V_{hh}=\left(0,5+1,5+1+2\right).22,4=112\left(l\right)\)
b,\(m_{hh}=m_{H2}+m_{O2}+m_{CO2}+m_{N2}\)
\(=0,5.21,5.32+1.44+2.28=149\left(g\right)\)
c,Tổng số phân tử
\(=\left(0,5+1,5+1+1\right).6.10^{23}=30.10^{23}\)
a) \(CH_4+2O_2\underrightarrow{t\text{°}}CO_2+2H_2O\)(1)
___0,5------>1___________________(mol)
\(2H_2+O_2\underrightarrow{t\text{°}}2H_2O\)(2)
0,25->0,125__0,25____(mol)
\(2KClO_3\underrightarrow{t\text{°}}2KCl+3O_2\)(3)
0,75<---------------0,125+1=1,125(mol)
=> mKClO3= 0,75*122,5=91,875(g)
b) n Al= 6,75/27=0,25(mol)
n Zn= 9,75/65= 0,15 (mol)
\(4Al+2O_2\underrightarrow{t\text{°}}2Al_2O_3\) (1')
0.25-->0.125_________(mol)
\(2Zn+O_2\underrightarrow{t\text{}\text{°}}2ZnO\) (2')
0.15->0.075_________(mol)
\(2KClO_3\underrightarrow{t\text{°}}2KCl+3O_2\)(3')
\(\frac{2}{15}\)<-------------------0.075+0.125=0.2(mol)
m KClO3=\(\frac{2}{15}\)*122,5=\(\frac{49}{3}\) (g)
\(a.\overline{M}_A=\dfrac{n_{O_2}\cdot M_{O_2}+n_{N_2}\cdot M_{N_2}+n_{CO_2}\cdot M_{CO_2}+n_{H_2}\cdot M_{H_2}}{n_{O_2}+n_{N_2}+n_{CO_2}+n_{H_2}}\\ =\dfrac{0,2\cdot32+0,1\cdot28+0,05\cdot44+0,15\cdot2}{0,2+0,1+0,05+0,15}\\ =\dfrac{11,7}{0,5}=23,4\left(g/mol\right)\)
b) \(d_{hh/CH_4}=\dfrac{23,4}{16}=1,4625\)
b, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(n_P=\dfrac{6,2}{31}=0,2mol\\n_{O_2}=\dfrac{0,2.5}{4}=0,25mol \)
\(S+O_2\underrightarrow{t^o}SO_2\)
\(n_S=\dfrac{3,2}{32}=0,1mol\\ n_{O_2}=0,1mol\)
\(C+O_2\underrightarrow{t^o}CO_2\)
\(n_C=\dfrac{2,4}{12}=0,2mol\\ n_{O_2}=0,2mol\\ n_{O_2}\left(tổng\right)=\)
\(0,25+0,1+0,2=0,55mol\\ m_{O_2}\left(trong.hh.B\right)=0,55.32=17,6g\)
a, \(m_{Fe}=0,25.56=14g\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
\(\Rightarrow n_{O_2}=\dfrac{0,25.2}{3}=0,16mol\\ m_{O_2}=0,16.32=5,12g\)
\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
\(n_{O_2}=\dfrac{0,25.3}{4}=0,1875mol\\ m_{O_2}=0,1875.32=6g\)
\(2Zn+O_2\underrightarrow{t^o}2ZnO\)
\(n_{O_2}=\dfrac{0,5.1}{2}=0,25mol\\ m_{O_2}=0,25.32=8g\)
\(\Rightarrow m_{O_2}\left(trong.hỗn.hợp.A\right)=\) \(5,12+6+8=19,12g\)
a) mFeSO4= 0,25.152=38(g)
b) mFeSO4= \(\dfrac{13,2.10^{23}}{6.10^{23}}.152=334,4\left(g\right)\)
c) mNO2= \(\dfrac{8,96}{22,4}.46=18,4\left(g\right)\)
d) mA= 27.0,22+64.0,25=21,94(g)
e) mB= \(\dfrac{11,2}{22,4}.32+\dfrac{13,44}{22,4}.28=32,8\left(g\right)\)
g) mC= \(64.0,25+\dfrac{15.10^{23}}{6.10^{23}}.56=156\left(g\right)\)
h) mD= \(0,25.32+\dfrac{11,2}{22,4}.44+\dfrac{2,7.10^{23}}{6.10^{23}}.28=42,6\left(g\right)\)
hơi muộn nha<3
a) 3Fe+2O2--->FE3O4
0,5------1/3 (mol)
4Al+3O2---.2Al2O3
1,25--0,9375(mol)
2Zn+O2--->2ZnO
1,5---0,75(mol)
n O2=1/3+0,9375+0,75=2,02(mol)
m O2=2,02.32=64,64(g)
b) 4P+5O2-->2P2O5
0,1-----0,125(mol)
S+02--->SO2
0,2--0,2(mol)
C+O2-->CO2
0,3--0,3(mol)
n O2=0,125+0,2+0,3=0,625(mol)
m O2=0,625.32=20(g)
c) n CH4=1,6/16=0,1(mol)
n CO=2,8/28=0,1(mol)
n C4H10=0,58/58=0,01(mol)
CH4+2O2--->CO2+2H2O
0,1---0,2(mol)
2CO+O2-->2CO2
0,1--0,05(mol)
C4H10+13/2O2--->4CO2+5H2O
0,01-----0,065(mol)
n O2=0,2+0,05+0,065=0,315(mol)
m O2=0,315.32=10,08(g)