a, 2H₂ + O₂ \(\underrightarrow{t^o}\) 2H₂O

b, \(n_{H_2}=\dfrac{6,5}{22,4}\approx0,3\left(mol\right)\)

\(n_{O_2}=\dfrac{0,3}{2}=0,15\left(mol\right)\\ V_{O_2}=0,15.22,4=3,36\left(l\right)\)

PTHH: 2H2 + O2 -> (t°) 2H2O

Ta có: nO2 = 1/2 . nH2

=> VO2 = 1/2 . VH2 = 1/2 . 6,5 = 3,25 (l)

\(n_{H_2}=\dfrac{V_{H_2}}{22,4}=\dfrac{5,6}{22,4}=0,25mol\)

\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)

0,25   0,125                               ( mol )

\(V_{O_2}=n_{O_2}.22,4=0,125.22,4=2,8l\)

a)2H₂ + O₂ --t^o--> 2H₂O

b) \(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

PTHH: 2H₂ + O₂ --t^o--> 2H₂O

            0,5-->0,25------>0,5

=> \(m_{H_2O}=0,5.18=9\left(g\right)\)

c) V_O2 = 0,25.22,4 = 5,6 (l)

=> V_kk = 5,6 : 20% = 28 (l)

\(n_{CH_4}=\dfrac{V_{CH_4}}{22,4}=\dfrac{5,6}{22,4}=0,25mol\)

\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)

0,25      0,5            0,,25      0,5   ( mol )

\(V_{O_2}=n_{O_2}.22,4=0,5.22,4=11,2l\)

\(m_{CO_2}=n_{CO_2}.M_{CO_2}=0,25.44=11g\)

\(m_{H_2O}=n_{H_2O}.M_{H_2O}=0,5.18=9g\)

CH4+2O2-to>CO2+2H2O

0,25---0,5--------0,25---0,5

n CH4=\(\dfrac{5,6}{22,4}\)=0,25 mol

=>VO2=0,5.22,4=11,2l

=>m CO2=0,25.44=11g

=>m H2O=0,5.18=9g

a)

PTHH: 3Fe + 2O₂  ^{____\(t^o\)____}> Fe₃O₄  (1) 

b) Ta có: n_Fe  = \(\dfrac{25.2}{56}=0.45\left(mol\right)\)

Theo (1): n_{\(O_2\)}= \(\dfrac{2}{3}n_{Fe}=\dfrac{2}{3}0.45=0.3\left(mol\right)\)

=> \(V_{O_2\left(đktc\right)}=0.3\cdot22.4=6.72\left(l\right)\)

c) PTHH: 2KClO₃ ^{__\(t^o\)___}>  2KCl + 3O₂   (2)

-Muốn điều chế được lượng oxi dùng cho phản ứng trên thì \(n_{O_2\left(2\right)}=n_{O_2\left(1\right)}=0.3\left(mol\right)\)

Theo (2) \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{2}{3}0.3=0.2\left(mol\right)\)

=> \(m_{KClO_3}=0.2\cdot122.5=24.5\left(g\right)\)

n_Fe = 16.8/56 = 0.3 (mol) 

3Fe + 2O₂ -to-> Fe₃O₄ 

0.3......0.2...........0.1

VO2 = 0.2*22.4 = 4.48 (l) 

mFe3O4 = 0.1*232 = 23.2 (g) 

Nhanh the anh oi tu tu thoi

2Zn+O2-to>2ZnO

0,1---0,05----0,1

n Zn=\(\dfrac{6,5}{65}\)=0,1 mol

n O2=\(\dfrac{0,8}{32}\)=0,025 mol

=>VO2=0,05.22,4=1,12l

=>mZnO=0,1.81=8,1g

c)Zn dư

=>m ZnO=0,05.81=4,05g

\(1,2H_2+O_2\underrightarrow{t}2H_2O\)

\(2Mg+O_2\underrightarrow{t}2MgO\)

\(2Cu+O_2\underrightarrow{t}2CuO\)

\(S+O_2\underrightarrow{t}SO_2\)

\(4Al+3O_2\underrightarrow{t}2Al_2O_3\)

\(C+O_2\underrightarrow{t}CO_2\)

\(4P+5O_2\underrightarrow{t}2P_2O_5\)

\(2,PTHH:C+O_2\underrightarrow{t}CO_2\)

\(a,n_{O_2}=0,2\left(mol\right)\Rightarrow n_{CO_2}=0,2\left(mol\right)\Rightarrow m_{CO_2}=8,8\left(g\right)\)

\(b,n_C=0,3\left(mol\right)\Rightarrow n_{CO_2}=0,3\left(mol\right)\Rightarrow m_{CO_2}=13,2\left(g\right)\)

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.

\(a,n_{O_2}\left(dư\right)=0,05\left(mol\right)\Rightarrow m_{O_2}\left(dư\right)=1,6\left(g\right)\)

\(b,n_{P_2O_5}=0,1\left(mol\right)\Rightarrow m_{P_2O_5}=14,2\left(g\right)\)

đủ cả 9 câu bạn nhé,

\(n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\)

\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)

0,6       0,3                  0,6        ( mol )

\(m_{H_2O}=0,6.18=10,8g\)

\(V_{kk}=V_{O_2}.5=\left(0,3.22,4\right).5=33,6l\)