Bài 1

H2+ 1/2O2 --> H2O

Mg + 1/2O2 --> MgO

Cu+ 1/2O2-->CuO

S+O2 -->SO2

4Al+ 3O2-->2Al2O3

C+ O2--> CO2

2P+5/2O2--> P2O5

Bài 2

CH4+2O2->CO2+2H2O

2C2H2+5O2->4CO2+2H2O

C2H6O+3O2->2CO2+3H2O

Đáp án:

VO2=22,4 (l); VCO2=11,2 (l)��2=22,4 (�); ���2=11,2 (�)

Giải thích các bước giải:

Ta có:

\(n_{O_2}=\dfrac{1456:1000}{22,4}=0,065\left(mol\right)\\ a,2C_4H_{10}+13O_2\rightarrow\left(t^o\right)8CO_2+10H_2O\\ b,n_{CO_2}=\dfrac{8}{13}.0,065=0,04\left(mol\right)\\ n_{H_2O}=\dfrac{10}{13}.0,065=0,05\left(mol\right)\\ b,m_{sp}=m_{CO_2}+m_{H_2O}=44.0,04+18.0,05=2,66\left(g\right)\\ c,n_{C_4H_{10}}=\dfrac{2}{13}.0,065=0,01\left(mol\right)\\ V_{gas}=\dfrac{100}{80}.0,01.22,4=0,28\left(l\right)\)

a) nCH4=1,6/16=0,1(mol)

CH4 +  2 O2 -to-> CO2 + 2 H2O

nCO2=nCH4=0,1(mol)

nBa(OH)2= 0,3(mol)

Ta có: nCO2/nOH- = 0,1/0,3=1/3 <1

=> Sp thu được chỉ có muối trung hòa duy nhất đồng thời Ba(OH)2 dư.

PTHH: Ba(OH)2 + CO2 -> BaCO3 + H2O

nBaCO3=nCO2=0,1(mol) => mBaCO3=0,1. 197=19,7(g)

Em xem nếu không hiểu chỗ nào thì hỏi lại he!

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

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

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

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

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

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

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

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

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

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

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,

nó bị lỗi

\(n_{C_2H_5OH}=\dfrac{2,3}{46}=0,05\left(mol\right)\)

PTHH: C₂H₅OH + 3O₂ --t^o--> 2CO₂ + 3H₂O

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

=> m_CO2 = 0,1.44 = 4,4 (g)

a) PTHH \(C_2H_5OH+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)

b) Khối lượng mol của rượu etylic là \(M_{etylic}=2M_C+5M_H+M_O+M_H=2.12+5.1+16+1=46\left(g/mol\right)\)

Số mol rượu etylic tham gia phản ứng là \(n_{etylic}=\dfrac{m_{etylic}}{M_{etylic}}=\dfrac{2,3}{46}=0,05\left(mol\right)\)

PTHH \(C_2H_5OH+3O_2\underrightarrow{t^o}2CO_2+3H_2O\)

TL mol      1         :    3   :      2     :     3

pứ mol     0,05     :    ?   :      ?     :      ?

\(\Rightarrow n_{CO_2}=0,1\left(mol\right)\)

Khối lượng mol của CO₂ là \(M_{CO_2}=M_C+2M_O=12+2.16=44\left(g/mol\right)\)

Khối lượng CO₂ hình thành là \(m_{CO_2}=n_{CO_2}.M_{CO_2}=0,1.44=4,4\left(g\right)\)

c) Dễ dàng tính được \(n_{O_2}=1,5\left(mol\right)\)

Thể tích khí oxi cần dùng là \(V_{O_2}=n_{O_2}.22,4=0,15.22,4=3,36\left(l\right)\)

Thể tích không khí cần dùng là \(V_{kk}=\dfrac{V_{O_2}.100\%}{21\%}=\dfrac{3,36.100}{21}=16\left(l\right)\)

\(n_{O_2}=\dfrac{8}{32}=0.25\left(mol\right)\)

\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)

\(0.125....0.25....0.125\)

\(m_{CH_4}=0.125\cdot16=2\left(g\right)\)

\(V_{CO_2}=0.125\cdot22.4=2.8\left(l\right)\)

\(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\)

\(............0.125.....0.125\)

\(m_{CaCO_3}=0.125\cdot100=12.5\left(g\right)\)