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nO2=48/32=1,5(mol)
a) PTHH: C+ O2 -to-> CO2
nC=nO2=1,5(mol)
=> mC=nC.M(C)=1,5.12=18(g)
b) PTHH: S+ O2 -to-> SO2
nS=nO2=1,5(mol)
=> mS=nS.M(S)=1,5.32= 48(g)
c) PTHH: 4P + 5 O2 -to->2 P2O5
nP= 4/5. nO2=4/5 . 1,5=1,2(mol)
=>mP=1,2.31=37,2(g)
Chúc em học tốt!
\(n_{O_2}=\dfrac{48}{32}=1.5\left(mol\right)\)
\(a.\)
\(C+O_2\underrightarrow{^{^{t^0}}}CO_2\)
\(n_C=n_{O_2}=1.5\left(mol\right)\)
\(m_C=1.5\cdot12=18\left(g\right)\)
\(b.\)
\(S+O_2\underrightarrow{^{^{t^0}}}SO_2\)
\(n_S=n_{O_2}=1.5\left(mol\right)\)
\(m_S=1.5\cdot32=48\left(g\right)\)
\(c.\)
\(4P+5O_2\underrightarrow{^{^{t^0}}}2P_2O_5\)
\(n_P=\dfrac{4}{5}\cdot n_{O_2}=\dfrac{4}{5}\cdot1.5=1.2\left(mol\right)\)
\(m_P=1.2\cdot31=37.2\left(g\right)\)
Ta có: \(n_{O_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)
a) PTHH: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
Theo PTHH: \(n_{Fe}=\dfrac{3}{2}n_{O_2}=0,06\left(mol\right)\) \(\Rightarrow m_{Fe}=0,06\cdot56=3,36\left(g\right)\)
b và c tương tự
d) PTHH: \(4FeS+7O_2\underrightarrow{t^o}2Fe_2O_3+4SO_2\)
The PTHH: \(n_{FeS}=\dfrac{4}{7}n_{O_2}=\dfrac{4}{175}\left(mol\right)\)
\(\Rightarrow m_{FeS}=\dfrac{4}{175}\cdot88\approx2,01\left(g\right)\)
\(1,2H_2+O_2\underrightarrow{t}2H_2O\)
\(2Mg+O_2\underrightarrow{t}2MgO\)
\(2Cu+O_2\underrightarrow{t}2CuO\)
\(S+O_2\underrightarrow{t}SO_2\)
\(4Al+3O_2\underrightarrow{t}2Al_2O_3\)
\(C+O_2\underrightarrow{t}CO_2\)
\(4P+5O_2\underrightarrow{t}2P_2O_5\)
\(2,PTHH:C+O_2\underrightarrow{t}CO_2\)
\(a,n_{O_2}=0,2\left(mol\right)\Rightarrow n_{CO_2}=0,2\left(mol\right)\Rightarrow m_{CO_2}=8,8\left(g\right)\)
\(b,n_C=0,3\left(mol\right)\Rightarrow n_{CO_2}=0,3\left(mol\right)\Rightarrow m_{CO_2}=13,2\left(g\right)\)
c, Vì\(\frac{0,3}{1}>\frac{0,2}{1}\)nên C phản ửng dư, O2 phản ứng hết, Bài toán tính theo O2
\(n_{O_2}=0,2\left(mol\right)\Rightarrow n_{CO_2}=0,2\left(mol\right)\Rightarrow m_{CO_2}=8,8\left(g\right)\)
\(3,PTHH:CH_4+2O_2\underrightarrow{t}CO_2+2H_2O\)
\(C_2H_2+\frac{5}{2}O_2\underrightarrow{t}2CO_2+H_2O\)
\(C_2H_6O+3O_2\underrightarrow{t}2CO_2+3H_2O\)
\(4,a,PTHH:4P+5O_2\underrightarrow{t}2P_2O_5\)
\(n_P=1,5\left(mol\right)\Rightarrow n_{O_2}=1,2\left(mol\right)\Rightarrow m_{O_2}=38,4\left(g\right)\)
\(b,PTHH:C+O_2\underrightarrow{t}CO_2\)
\(n_C=2,5\left(mol\right)\Rightarrow n_{O_2}=2,5\left(mol\right)\Rightarrow m_{O_2}=80\left(g\right)\)
\(c,PTHH:4Al+3O_2\underrightarrow{t}2Al_2O_3\)
\(n_{Al}=2,5\left(mol\right)\Rightarrow n_{O_2}=1,875\left(mol\right)\Rightarrow m_{O_2}=60\left(g\right)\)
\(d,PTHH:2H_2+O_2\underrightarrow{t}2H_2O\)
\(TH_1:\left(đktc\right)n_{H_2}=1,5\left(mol\right)\Rightarrow n_{O_2}=0,75\left(mol\right)\Rightarrow m_{O_2}=24\left(g\right)\)
\(TH_2:\left(đkt\right)n_{H_2}=1,4\left(mol\right)\Rightarrow n_{O_2}=0,7\left(mol\right)\Rightarrow m_{O_2}=22,4\left(g\right)\)
\(5,PTHH:S+O_2\underrightarrow{t}SO_2\)
\(n_{O_2}=0,46875\left(mol\right)\)
\(n_{SO_2}=0,3\left(mol\right)\)
Vì\(0,46875>0,3\left(n_{O_2}>n_{SO_2}\right)\)nên S phản ứng hết, bài toán tính theo S.
\(a,\Rightarrow n_S=n_{SO_2}=0,3\left(mol\right)\Rightarrow m_S=9,6\left(g\right)\)
\(n_{O_2}\left(dư\right)=0,16875\left(mol\right)\Rightarrow m_{O_2}\left(dư\right)=5,4\left(g\right)\)
\(6,a,PTHH:C+O_2\underrightarrow{t}CO_2\)
\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_C=1,5\left(mol\right)\Rightarrow m_C=18\left(g\right)\)
\(b,PTHH:2H_2+O_2\underrightarrow{t}2H_2O\)
\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_{H_2}=0,75\left(mol\right)\Rightarrow m_{H_2}=1,5\left(g\right)\)
\(c,PTHH:S+O_2\underrightarrow{t}SO_2\)
\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_S=1,5\left(mol\right)\Rightarrow m_S=48\left(g\right)\)
\(d,PTHH:4P+5O_2\underrightarrow{t}2P_2O_5\)
\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_P=1,2\left(mol\right)\Rightarrow m_P=37,2\left(g\right)\)
\(7,n_{O_2}=5\left(mol\right)\Rightarrow V_{O_2}=112\left(l\right)\left(đktc\right)\);\(V_{O_2}=120\left(l\right)\left(đkt\right)\)
\(8,PTHH:C+O_2\underrightarrow{t}CO_2\)
\(m_C=0,96\left(kg\right)\Rightarrow n_C=0,08\left(kmol\right)=80\left(mol\right)\Rightarrow n_{O_2}=80\left(mol\right)\Rightarrow V_{O_2}=1792\left(l\right)\)
\(9,n_p=0,2\left(mol\right);n_{O_2}=0,3\left(mol\right)\)
\(PTHH:4P+5O_2\underrightarrow{t}2P_2O_5\)
Vì\(\frac{0,2}{4}< \frac{0,3}{5}\)nên P hết O2 dư, bài toán tính theo P.
\(a,n_{O_2}\left(dư\right)=0,05\left(mol\right)\Rightarrow m_{O_2}\left(dư\right)=1,6\left(g\right)\)
\(b,n_{P_2O_5}=0,1\left(mol\right)\Rightarrow m_{P_2O_5}=14,2\left(g\right)\)
a) S + O2 --to--> SO2
b) \(n_S=\dfrac{1,6}{32}=0,05\left(mol\right)\)
PTHH: S + O2 --to--> SO2
0,05-->0,05--->0,05
=> VSO2 = 0,05.22,4 = 1,12 (l)
c)
PTHH: 2KClO3 --to--> 2KCl + 3O2
\(\dfrac{1}{30}\)<-----------------0,05
=> \(m_{KClO_3}=\dfrac{1}{30}.122,5=\dfrac{49}{12}\left(g\right)\)
n O2=33,6/22,4=1,5(mol)
a) C+O2------>CO2
1,5<--1,5
m C=1,5.12=18(g)
b) 2H2+O2----->2H2O
3<------1,5
m H2=3.2=6(g)
c) S+O2----->SO2
1,5<----1,5
m S=1,5.32=48(g)
d) 4P+5O2--->2P2O5
1,2<----1,5
m P=1,2.31=37,2(g)
+nO2 = 33,6 /22,4 = 1,5 (mol)
A. C + O2 -----------> CO2 (1)
Theo (1) : nC = nO2 = 1,5 (mol)
=> m C = 1,5 .12 = 18 (g)
B. 2H2 + O2 --------> 2H2O (2)
Theo (2) : nH2 = 2nO2 = 1,5.2=3 (mol)
=> m H2 = 3.2 = 6 g
C. S + O2 -------> SO2 (3)
Theo (3) : nS = nO2 = 1,5 (mol)
=> mS= 1,5 . 32 = 48 (g)
D. 4P +5O2 -----------> 2P2O5 (4)
Theo (4) : nP = nO2 . 4/5 = 1,5 .4/5 = 1,2 (mol)
=> mP = 31 .1,2 = 37,2 (g)
\(n_{KMnO_4}=\dfrac{15.8}{158}=0.1\left(mol\right)\)
\(2KMnO_4\underrightarrow{t^0}K_2MnO_4+MnO_2+O_2\)
\(n_{O_2}=\dfrac{0.1}{2}=0.05\left(mol\right)\)
\(V_{O_2}=0.05\cdot22.4=1.12\left(l\right)\)
\(b.\)
\(n_P=\dfrac{6.2}{31}=0.2\left(mol\right)\)
\(4P+5O_2\underrightarrow{t^0}2P_2O_5\)
\(4.........5\)
\(0.2........0.05\)
\(LTL:\dfrac{0.2}{4}>\dfrac{0.05}{5}\Rightarrow Pdư\)
\(m_{P\left(dư\right)}=\left(0.2-0.04\right)\cdot31=4.96\left(g\right)\)
PTHH:2KMnO4--- K2MnO4+MnO2 +O2
ADCT nKmno4=15,8/158=0,1 mol
a, theo pt có nO2/nKmno4= 1/2
nO2=0,05 mol
ADCT V=n*22,4
VO2=0,05*22,4 =1,12 l
b, PTHH: 5O2+4P---2P2O5
ADCTnP=6,2/31=0,2 mol
Theo pt
nO2/5=0,01 bé hơn nP/4=0,05
P dư
theo pt nP(pư)/nO2=4/5
nP(p/ư)=0,04 mol
nP(dư)=0,05-0,04 =0,01 mol
ADCT:m=n*M
mP(dư)=0,01*31=0,31g
nO2= 1,5(mol)
PTHH: 4P + 5 O2 -to-> 2 P2O5
nP= 4/5.nO2= 4/5.1,5= 1,2(mol)
=>mP= 1,2. 31= 37,2(g)
---
S+ O2-to-> SO2
nS= nO2= 1,5(mol)
=>mS= 1,5.32= 48(g)
---
C+ O2-to->CO2
nC= nO2= 1,5(mol)
=>mC=1,5.12=18(G)
---
3 Fe+ 2 O2 -to-> Fe3O4
nFe=3/2. nO2= 3/2 .1,5=2,25(mol)
=>mFe= 2,25.56=126(g)
---
2 Zn+ O2 -to->ZnO
=> nZn=2.nO2= 2.1,5=3(mol)
=>mZn=3.65=195(g)
\(n_{O2}=1,5\left(mol\right)\)
a) \(C+O_2\underrightarrow{t^O}CO_2\)
1,5________1,5(mol)
\(m_C=1,5.12=18\left(g\right)\)
b) \(2H_2+O_2\underrightarrow{t^O}2H_2O\)
3________1,5_____3(mol)
\(m_{H2}=3.2=6\left(g\right)\)
c) \(S+O_2\underrightarrow{t^O}SO_2\)
1,5__________1,5(mol)
\(m_S=1,5.32=48\left(g\right)\)
Chúc bạn học tốt
cảm ơn ạ
n\(_{O2}=\frac{48}{32}=1,5\left(mol\right)\)
a) O2+C--->CO2
1,5---1,5
m\(_C=1,5.12=18\left(g\right)\)
b) O2+S-->SO2
1,5--------1,5
M\(_S=1,5.32=48\left(g\right)\)
c) 5O2+4P---->2P2O5
1,5------1,2
m\(_P=1,2.31=37,2\left(g\right)\)