720: viết khủng v

PTHH:

\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)

x            x               x            x

\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)

y             3y                 2y           3y

Ta có hệ PT:

\(\left\{{}\begin{matrix}x+y=\dfrac{9,916}{24,79}=0,4\\80x+160y=24\end{matrix}\right.\)

\(\Rightarrow x=y=0,1\) (mol) 

\(m_{kl}=0,1.64+0,2.56=17,6\left(g\right)\)

Ta có:

\(n_C:n_H:n_O=\dfrac{52,17}{12}:\dfrac{13,04}{1}:\dfrac{100-52,17-13,04}{16}=2:6:1\)

=> CTPT là C2H6O

C2H5OH ( rượu etylic )

\(m_{NaOH}=100.4\%=4\left(g\right)\)

\(n_{NaOH}=4:40=0,1\left(mol\right)\)

PTHH:

\(NaOH+HCl\rightarrow NaCl+H_2O\)

0,1            0,1           0,1

\(a,m_{HCl}=0,1.36,5=3,65\left(g\right)\)

\(b,m_{ddHCl}=3,65:3,56\%=100\left(g\right)\)

\(c,m_{NaCl}=0,1.58,5=5,85\left(g\right)\)