1)

a) \(n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)

b) \(n_{CH_4}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

c) \(n_{H_2O}=\dfrac{15.10^{23}}{6.10^{23}}=2,5\left(mol\right)\)

2)

a) \(n_A=\dfrac{2,24}{22,4}=0,1\left(mol\right)\) => M_A = \(\dfrac{3}{0,1}=30\left(g/mol\right)\)

b) \(d_{A/O_2}=\dfrac{30}{32}=0,9375\)

a) \(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)

b) \(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)

c) \(M_A=1,172.29=34\left(g/mol\right)\)

\(n_A=\dfrac{33,6}{22,4}=1,5\left(mol\right)\)

=> m_A = 1,5.34 = 51(g)

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

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

Ta có: \(n_{CH_4}+n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\left(1\right)\)

Theo PT: \(n_{H_2O}=2n_{CH_4}+n_{H_2}=\dfrac{16,2}{18}=0,9\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,4\left(mol\right)\\n_{H_2}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,4.22,4}{11,2}.100\%=80\%\\\%V_{H_2}=20\%\end{matrix}\right.\)

b, Theo PT: \(n_{CO_2}=n_{CH_4}=0,4\left(mol\right)\Rightarrow V_{CO_2}=0,4.22,4=8,96\left(l\right)\)

Giả sử có 1 mol khí Cl₂, 2 mol khí O₂

a) \(\left\{{}\begin{matrix}\%V_{Cl_2}=\dfrac{1}{1+2}.100\%=33,33\%\\\%V_{O_2}=\dfrac{2}{1+2}.100\%=66,67\%\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%m_{Cl_2}=\dfrac{1.71}{1.71+2.32}.100\%=52,59\%\\\%m_{O_2}=\dfrac{2.32}{1.71+2.32}.100\%=47,41\%\end{matrix}\right.\)

b) \(\overline{M}=\dfrac{1.71+2.32}{1+2}=45\left(g/mol\right)\)

=> \(d_{A/H_2}=\dfrac{45}{2}=22,5\)

c) \(n_A=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

=> m_A = 0,3.45 = 13,5 (g)

n CO 2  = 0,4mol

Thể tích của khí CO 2 :   V CO 2  = 0,4 x 22,4 = 8,96l

a, khối lượng của 2,5 mol CuO là:
\(m=n.M=2,5.80=200\left(g\right)\)

b, số mol của 4,48 lít khí CO2 (đktc) là:
\(n=\dfrac{V}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

a.

mCuO=n.M=2,5.(1.64+1.16)= 200 mol

b.nCO₂=V/22,4=4,48:22,4=0,2 mol