PTHH: \(2Na+2H_2O\rightarrow2NaOH+H_2\)
\(n_{Na}=\dfrac{m}{M}=\dfrac{4,6}{23}=0,2\left(mol\right)\)
\(n_{Na}=n_{NaOH}=0,2\left(mol\right)\)
\(m_{NaOH}=n.M=0,2.40=8\left(g\right)\)
\(n_{H_2}=\dfrac{1}{2}n_{Na}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\)
\(V_{H_2\left(đktc\right)}=n.22,4=0,1.22,4=2,24\left(l\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{26}{65}=0,4\left(mol\right)\)
\(n_{HCl}=2n_{Zn}=2.0,4=0,8\left(mol\right)\)
\(m_{HCl}=n.M=0,8.36,5=29,2\left(g\right)\)
\(n_{H_2}=n_{Zn}=0,4\left(mol\right)\)
\(V_{H_2\left(đktc\right)}=n.22,4=0,4.22,4=8,96\left(l\right)\)
6
\(m_C=\dfrac{7500000.80}{100}=6000000\left(g\right)\)
\(n_C=\dfrac{6000000}{12}=500000\left(mol\right)\)
PTHH: \(C+O_2\rightarrow CO_2\)
\(n_C=n_{O_2}=500000\left(mol\right)\)
\(m_{O_2}=500000.32=16000000\left(g\right)=16\left(tấn\right)\)
7
PTHH: \(C+O_2\rightarrow CO_2\)
\(n_C=\dfrac{\dfrac{12000}{12}}{80\%}=1250\left(mol\right)\)
\(n_C=n_{O_2}=1250\left(mol\right)\)
\(m_{O_2}=1250.32=40000\left(g\right)=40\left(kg\right)\)
