\(PTHH:2Zn+O_2->2ZnO\)

BĐ           0,4      0,3               (mol)

PU           0,4---->0,2--->0,4   (mol) 

CL            0------->0,1---->0,4  (mol)

a)

\(n_{Zn}=\dfrac{m}{M}=\dfrac{26}{65}=0,4\left(mol\right)\\ n_{O_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

\(\dfrac{n_{Zn}}{2}< \dfrac{n_{O_2}}{1}\left(\dfrac{0,4}{2}< \dfrac{0,3}{1}\right)\)

=> Zn hết, O2 dư ( tính theo Zn)

b)

\(m_{ZnO}=n\cdot M=0,4\cdot\left(65+16\right)=32,4\left(g\right)\)

\(n_{Al}=\dfrac{5,4}{27}=0,2mol\)

\(n_{O_2}=\dfrac{4,48}{22,4}=0,2mol\)

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

0,2                0,1

\(m_{Al_2O_3}=0,1\cdot102=10,2g\)

\(n_{Al}=\dfrac{5.4}{27}=0,2\left(mol\right)\)

\(n_{O_2}=\dfrac{4.48}{22,4}=0,2\left(mol\right)\)

PTHH : 4Al + 3O₂ ---t^o---> 2Al₂O₃

             0,2                          0,1              

Ta thấy : \(\dfrac{0.2}{4}< \dfrac{0.2}{3}\) => Al đủ , O₂ dư

\(m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)

a.\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2mol\)

\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)

 4        3                     2         ( mol )

0,2                           0,1

\(m_{Al_2O_3}=n_{Al_2O_3}.M_{Al_2O_3}=0,1.102=10,2g\)

b.\(n_{Al}=\dfrac{m}{M}=\dfrac{5,4}{27}=0,2mol\)

\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{2,24}{22,4}=0,1mol\)

\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)

4         3                    2             

0,2   < 0,1                                 ( mol )

           0,1                1/15

\(m_{Al_2O_3}=n.M=\dfrac{1}{15}.102=6,8g\)

a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

PTHH : 4Al + 3O₂ -> 2Al₂O₃

             0,2                  0,1

\(m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)

b. \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

\(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

PTHH :  4Al + 3O₂ -> 2Al₂O₃

                        0,1         \(\dfrac{0,2}{3}\)           

Xét tỉ lệ : \(\dfrac{0,2}{4}>\dfrac{0,1}{3}\) => Al dư , O₂ đủ

\(m_{Al_2O_3}=\dfrac{0,2}{3}.102=6,8\left(g\right)\)

Cập nhật lại câu hỏi đi bạn ~

\(n_P=\dfrac{3,1}{31}=0,1\left(mol\right)\)

\(n_{O_2}=\dfrac{4,48}{22,4}=0,2mol\)

4P + 5O₂ \(\underrightarrow{t^o}\) 2P₂O₅

\(\dfrac{0,1}{4}< \dfrac{0,2}{5}\) => O₂ dư, Photpho đủ

\(n_{O_2}=0,2-0,04=0,16\left(mol\right)\)

\(m_{P_2O_5}=\) 0,05 . 142 = 7,1 ( g )

nP = 3.1/31 = 0.1 (mol) 

4P + 5O2 -to-> 2P2O5 

0.1__0.125_____0.05

mP2O5 = 0.05*142 = 7.1 (g) 

VO2 = 0.125 * 22.4 = 2.8 (l)

\(n_P=\dfrac{3.1}{31}=0.1\left(mol\right)\)

\(n_{O_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)

\(4P+5O_2\underrightarrow{t^0}2P_2O_5\)

\(0.08......0.1......0.04\)

\(m_{rắn}=m_{P\left(dư\right)}+m_{P_2O_5}=\left(0.1-0.08\right)\cdot31+0.04\cdot142=6.3\left(g\right)\)

Bảo toàn khối lượng : 

\(m_X=23.65-\dfrac{3.36}{22.4}\cdot32=18.85\left(g\right)\)

\(n_{H_2}=\dfrac{4.48}{22.4}=0.2\left(mol\right)\)

\(n_{e\left(c\right)}=2n_{H_2}+4n_{O_2}=2\cdot0.2+4\cdot0.15=1\left(mol\right)\)

\(\Rightarrow n_{Cl_2}=\dfrac{1}{2}\cdot n_e=\dfrac{1}{2}\cdot1=0.5\left(mol\right)\)

\(m_{muối}=m_X+m_{Cl_2}=18.85+0.5\cdot71=54.35\left(g\right)\)

\(n_{O_2}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)

\(n_{N_2O_5}=\dfrac{10.8}{108}=0.1\left(mol\right)\)

\(2N_2+5O_2\underrightarrow{t^0}2N_2O_5\)

\(.......0.25.....0.1\)

\(m_{O_2\left(dư\right)}=\left(0.3-0.25\right)\cdot32=1.6\left(g\right)\)

Câu 1/

\(2C\left(\dfrac{m}{12}\right)+O_2\left(\dfrac{m}{24}\right)\rightarrow2CO_2\left(\dfrac{m}{12}\right)\)

\(CO_2\left(\dfrac{m}{12}\right)+Ca\left(OH\right)_2\rightarrow CaCO_3\left(\dfrac{m}{12}\right)+H_2O\)

Nếu như O₂ thì tỷ khối của hỗn hợp so với O₂ phải là: \(\dfrac{44}{32}=1,375>1,25\) vậy trong hỗn hợp khí phải có O₂

\(n_C=\dfrac{m}{12}\left(mol\right)\)

\(n_{O_2}=\dfrac{V}{22,4}\left(mol\right)\)

\(\Rightarrow n_{O_2\left(dư\right)}=\dfrac{V}{22,4}-\dfrac{m}{12}\left(mol\right)\)

\(\Rightarrow\dfrac{44.\dfrac{m}{12}+32.\left(\dfrac{V}{22,4}-\dfrac{m}{24}\right)}{\dfrac{m}{12}+\dfrac{V}{22,4}-\dfrac{m}{24}}=1,25.32=40\)

\(\Leftrightarrow15V-28m=0\left(1\right)\)

Ta lại có: \(n_{CaCO_3}=\dfrac{6}{100}=0,06\left(mol\right)\)

\(\Rightarrow\dfrac{m}{12}=0,06\Leftrightarrow m=0,72\left(2\right)\)

Từ (1) và (2) ta có hệ: \(\left\{{}\begin{matrix}15V-28m=0\\m=0,72\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}m=0,72\left(g\right)\\V=1,344\left(l\right)\end{matrix}\right.\)