a)

\(n_{H_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ m_{H_2}=n\cdot M=0,25\cdot2=0,5\left(g\right)\)

b)

\(n_{O_2}=\dfrac{3\cdot10^{23}}{6\cdot10^{23}}=0,5\left(mol\right)\\ m_{O_2}=n\cdot M=0,5\cdot32=16\left(g\right)\)

a, \(n=\dfrac{V}{22,4}\left(đktc\right)=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

  \(M=2.H=2.1=2\)(g/mol)

  \(m=n.M=0,25.2=0,5\left(g\right)\)

b, \(n=\dfrac{3.10^{23}}{6.10^2}=0,5\left(mol\right)\)

   \(V=n.22,4\left(đktc\right)=0,5.22,4=11,2\left(l\right)\)

a. \(n_{Ag}=\dfrac{1,8.10^{25}}{6.10^{23}}=30\left(mol\right)\)

b. \(n_{CO_2}=\dfrac{59,4}{44}=1,35\left(mol\right)\)

c. \(n_{K_2O}=\dfrac{4,2.10^{22}}{6.10^{23}}=0,07\left(mol\right)\)

d. \(n_{CuSO_4}=\dfrac{18.10^{23}}{6.10^{23}}=3\left(mol\right)\)

e. \(n_{SO_2}=\dfrac{10,08}{22,4}=0,45\left(mol\right)\)

g. \(n_{Fe_3O_4}=\dfrac{52,2}{232}=0,225\left(mol\right)\)

h. \(n_{O_2}=\dfrac{6,72}{22,4}-0,3\left(mol\right)\)

i. \(n_{N_2}=\dfrac{13,6}{22,4}\approx0,6\left(mol\right)\)

a) 

\(V_{N_2}=\dfrac{17,92.62,5}{100}=11,2\left(l\right)\)

=> \(n_{N_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

Gọi số mol O₂ là a (mol)

=> n_X = 2a (mol)

Có: \(2a+a+0,5=\dfrac{17,92}{22,4}=0,8\)

=> a = 0,1 (mol)

\(\overline{M}_A=\dfrac{0,1.32+0,2.M_X+0,5.28}{0,8}=12,875.2=25,75\left(g/mol\right)\)

=> M_X = 17 (g/mol)

=> X là NH₃

b) \(\left\{{}\begin{matrix}\%m_{N_2}=\dfrac{0,5.28}{0,5.28+0,2.17+0,1.32}.100\%=67,961\%\\\%m_{O_2}=\dfrac{0,1.32}{0,5.28+0,2.17+0,1.32}.100\%=15,54\%\\\%m_{NH_3}=\dfrac{0,2.17}{0,5.28+0,2.17+0,1.32}.100\%=16,505\%\end{matrix}\right.\)

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

\(\overline{M}_B=\dfrac{0,5.28+0,2.17+0,1.32+0,4}{0,5+0,2+0,1+0,2}=21\left(g/mol\right)\)

Tính tỉ khối của B với gì vậy bn :) ?