a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

b, \(n_{CH_4}=\dfrac{3}{16}=0,1875\left(mol\right)\)

Theo PT: \(n_{CO_2}=n_{CH_4}=0,1875\left(mol\right)\Rightarrow m_{CO_2}=0,1875.44=8,25\left(g\right)\)

c, \(n_{CaCO_3}=n_{CO_2}=0,1875\left(mol\right)\Rightarrow m_{CaCO_3}=0,1875.100=18,75\left(g\right)\)

a) CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

CO₂ + Ca(OH)₂ --> CaCO₃ + H₂O

b) \(n_{CH_4}=\dfrac{8}{16}=0,5\left(mol\right)\)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

             0,5---->1-------->0,5

=> V_O2 = 1.22,4 = 22,4 (l)

c) 

PTHH: CO₂ + Ca(OH)₂ --> CaCO₃ + H₂O

             0,5------------------>0,5

=> m_CaCO3 = 0,5.100 = 50 (g)

\(n_{CH_4}=\dfrac{8}{18}=0,4\left(mol\right)\\ pthh:CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\) 
           0,4      0,8      0,4 
=> \(v_{O_2}=0,8.22,4=17,92\left(l\right)\) 
\(CO_2+CaCO_3+H_2O\rightarrow Ca\left(HCO_3\right)_2\) 
0,4                                 0,4 
=> \(m_{Ca\left(HCO_3\right)_2}=0,4.214=85,6\left(g\right)\)

a, \(n_{CH_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

PTHH:

CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

0,5--->1------------->0,5

Ca(OH)₂ + CO₂ ---> CaCO₃ + H₂O

                   0,5----->0,5

b, \(V_{O_2}=1.22,4=22,4\left(l\right)\)

c, \(m_{CaCO_3}=0,5.100=50\left(g\right)\)

Đáp án:

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

Giải thích các bước giải:

Ta có:

Gọi \(\left\{{}\begin{matrix}n_{C_2H_6}=a\left(mol\right)\\n_{C_2H_2}=b\left(mol\right)\end{matrix}\right.\left(đk:a,b>0\right)\)

\(n_{kt}=n_{CaCO_3}=\dfrac{150}{100}=1,5\left(mol\right)\)

PTHH: 

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

1,5<--------------------1,5

\(2C_2H_6+7O_2\underrightarrow{t^o}4CO_2+6H_2O\)

a----------------->2a

\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)

b------------------>2b

\(\rightarrow\left\{{}\begin{matrix}30a+26b=21,5\\2a+2b=1,5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,5\left(mol\right)\\b=0,25\left(mol\right)\end{matrix}\right.\left(TM\right)\\ \rightarrow\left\{{}\begin{matrix}\%V_{C_2H_6}=\dfrac{0,5}{0,5+0,25}.100\%=66,67\%\\\%V_{C_2H_2}=100\%-66,67\%=33,33\%\end{matrix}\right.\)

a. 4Al + 3O2 -> 2Al2O3

     0.3    0.225     0.15

b.\(n_{Al}=\dfrac{8.1}{27}=0.3mol\)

\(V_{O_2}=0.225\times22.4=5.04l\)

c.\(m_{Al_2O_3}=0.15\times102=15.3g\)

a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

\(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

b, Ta có: \(n_{CH_4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

Theo PT: \(n_{CaCO_3}=n_{CO_2}=n_{CH_4}=0,3\left(mol\right)\)

\(\Rightarrow m_{CaCO_3}=0,3.100=30\left(g\right)\)

Giúp em với ạaa

\(n_{CaCO_3}=\dfrac{25}{100}=0.25\left(mol\right)\)

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

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

\(C_{M_{Ca\left(OH\right)_2}}=\dfrac{0.25}{0.1}=2.5\left(M\right)\)

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

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

\(V_{CH_4}=0.25\cdot22.4=5.6\left(l\right)\)

a) nCaCO3=0,25(mol)

CH4 + 2 O2 -to-> CO2 + 2 H2O

0,25<------------------0,25(mol)

CO2 + Ca(OH)2 -> CaCO3 + H2O

0,25<------0,25-----------0,25(mol)

b) CMddCa(OH)2= 0,25/0,1= 2,5(M)

b) V(CH4,đktc)=0,25.22,4=5,6(l)

a) \(n_{CH_4}=\dfrac{V_{\left(\text{đ}ktc\right)}}{22,4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

PTHH: \(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)

b) Theo PTHH: \(n_{H_2O}=n_{O_2}=2n_{CH_4}=2.0,4=0,8\left(mol\right)\)

\(m_{H_2O}=n.M=0,8.18=14,4\left(g\right)\)

c) \(V_{O_2\left(\text{đ}ktc\right)}=n.22,4=0,8.22,4=17,92\left(l\right)\)

a) PTHH: C2H6O + 3 O2 -to-> 2CO2 + 3 H2O

b) nC2H6O=0,1(mol) => nCO2=2.0,1=0,2(mol)

PHHH: CO2 + Ca(OH)2 -> CaCO3 + H2O

nCaCO3=nCO2=0,2(mol)

=>m(kết tủa)=mCaCO3=0,2.100=20(g)

nC2H5OH = 4.6/46 = 0.1 (mol) 

C2H5OH + 3O2 -to-> 2CO2 + 3H2O 

0.1.................................0.2

Ca(OH)2 + CO2 => CaCO3 + H2O 

.....................0.2............0.2

mCaCO3 = 0.2 * 100 = 20 (g)