\(n_{H_2}=\dfrac{2,8}{22,4}=0,125\left(mol\right)\)

PTHH: \(2H_2+O_2\xrightarrow[]{t^\circ}2H_2O\)

       0,125 → 0,0625 → 0,125

a) \(V_{O_2}=0,0625\cdot22,4=1,4\left(l\right)\)

b) \(m_{H_2O}=0,125\cdot18=2,25\left(g\right)\)

\(n_{H_2}=\dfrac{2.8}{22.4}=0.125\left(mol\right)\)

\(2H_2+O_2\underrightarrow{^{t^0}}2H_2O\)

\(0.125..0.0625....0.125\)

\(m_{H_2}=0.125\cdot2=0.25\left(g\right)\)

\(m_{H_2O}=0.125\cdot18=2.25\left(g\right)\)

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

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

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

Bài 1:

PTHH: \(2C_4H_{10}+13O_2\xrightarrow[]{t^o}8CO_2+10H_2O\)

Ta có: \(n_{C_4H_{10}}=\dfrac{11,6}{58}=0,2\left(mol\right)\) 

\(\Rightarrow\left\{{}\begin{matrix}n_{CO_2}=0,8\left(mol\right)\\n_{H_2O}=1\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CO_2}=0,8\cdot44=35,2\left(g\right)\\m_{H_2O}=1\cdot18=18\left(g\right)\end{matrix}\right.\)

Bài 2:

PTHH: \(CaCO_3\xrightarrow[]{t^o}CaO+CO_2\uparrow\)

Ta có: \(n_{CO_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)=n_{CaO}=n_{CaCO_3\left(p.ứ\right)}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{CaO}=0,5\cdot56=28\left(g\right)\\\%m_{CaCO_3\left(p.ứ\right)}=\dfrac{0,5\cdot100}{100}\cdot100\%=50\%\end{matrix}\right.\)

Bài 3:

PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)

Tính theo sản phẩm

Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)=n_{MgCl_2}\) \(\Rightarrow m_{MgCl_2}=0,2\cdot95=19\left(g\right)\)

a.\(n_{CH_4}=\dfrac{V_{CH_4}}{22,4}=\dfrac{6,72}{22,4}=0,3mol\)

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

0,3       0,6                                          ( mol )

\(V_{O_2}=n_{O_2}.22,4=0,6.22,4=13,44l\)

b.

\(n_P=\dfrac{m_P}{M_P}=\dfrac{3,1}{31}=0,1mol\)

\(4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\)

0,1                         0,05    ( mol )

\(m_{P_2O_5}=n_{P_2O_5}.M_{P_2O_5}=0,05.142=7,1g\)

\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\) 

 3         2                   1       ( mol )

0,9      0,6                0,3      ( mol )

\(m_{Fe}=n_{Fe}.M_{Fe}=0,9.56=50,4g\)

\(V_{kk}=V_{O_2}:\dfrac{1}{5}=\left(0,6.22,4\right).5=13,44.5=67,2l\)

a. PTHH : 3Fe + 2O₂ -t^o> Fe₃O₄

                  0,9      0,6          0,3

\(m_{Fe}=56.0,9=50,4\left(g\right)\)

b. \(V_{O_2}=0,6.22,4=13,44\left(l\right)\)

\(\Rightarrow V_{kk}=13,44.5=67,2\left(l\right)\)

\(pthh:3Fe+2O_2\overset{t^o}{--->}Fe_3O_4\)

a. Theo pt: \(n_{Fe}=3.n_{Fe_3O_4}=3.0,3=0,9\left(mol\right)\)

\(\Rightarrow m_{Fe}=0,9.56=50,4\left(g\right)\)

b. Theo pt: \(n_{O_2}=\dfrac{2}{3}.n_{Fe}=\dfrac{2}{3}.0,9=0,6\left(mol\right)\)

\(\Rightarrow V_{kk}=0,6.22,4.5=67,2\left(lít\right)\)

2H2+O2-to>2H2O

0,25---0,125-----0,25

n H2=0,25 mol

=>m H2O=0,25.18=4,5g

=>Vkk=0,125.22,4.5=14l

\(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ PTHH:2H_2+O_2\underrightarrow{t^o}2H_2O\\ Mol:0,25\rightarrow0,125\rightarrow0,25\\ V_{kk}=0,125.5.22,4=14\left(l\right)\\ m_{H_2O}=0,25.18=4,5\left(g\right)\)

nH2=11,2/22,4=0,5(mol)

2H2+O2->2H2O

0,5     0,25      0,5

V(O2)=0,25*22,4=5,6(lít)

mH2O=0,5*18=9(g)

\(C_4H_{10}+\dfrac{13}{2}O_2-t^0->4CO_2+5H_2O\\ a.V_{KK}=\dfrac{5,6\cdot\dfrac{13}{2}}{0,2}=182\left(L\right)\\ b.CO_2+Ca\left(OH\right)_2->CaCO_3+H_2O\\ m_{KT}=100\cdot\dfrac{5,6}{22,4}\cdot4=100g\)