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PTK: + H3PO4 = 191 đvC
+ Na2CO3 = 106 đvC
+ SO3 = 80 đvC
+ NaOH = 49 đvC
+ Al2(SO4)3 = 342 đvC
PTK: + H3PO4 = 191 đvC
+ Na2CO3 = 106 đvC
+ SO3 = 80 đvC
+ NaOH = 49 đvC
+ Al2(SO4)3 = 342 đvC
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,n_{\left(NH_4\right)_3PO_4}=0,6\left(mol\right)\\ \Rightarrow n_N=0,6.3=1,8\left(mol\right)\Rightarrow m_N=1,8.14=25,2\left(g\right)\\ n_H=4.3.0,6=7,2\left(mol\right)\Rightarrow m_H=7,2.1=7,2\left(g\right)\\ n_P=n_{hc}=0,6\left(mol\right)\Rightarrow m_P=0,6.31=18,6\left(g\right)\\ n_O=4.0,6=2,4\left(mol\right)\Rightarrow m_O=2,4.16=38,4\left(g\right)\)
\(b,n_S=\dfrac{6,4}{32}=0,2\left(mol\right)\Rightarrow n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}.0,2=\dfrac{1}{15}\left(mol\right)\\ \Rightarrow m_{Al_2\left(SO_4\right)_3}=342.\dfrac{1}{15}=22,8\left(g\right)\\ c,n_{Al_2\left(SO_4\right)_3}=\dfrac{20,52}{342}=0,06\left(mol\right)\\ n_O=4.3.0,06=0,72\left(mol\right)\\ \Rightarrow n_{CO_2}=\dfrac{0,72}{2}=0,36\left(mol\right)\Rightarrow V_{CO_2\left(đktc\right)}=0,36.22,4=8,064\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) biết \(PTK_{Al_2\left(SO_4\right)_3}=2.27+\left(1.32+4.16\right).3=342\left(đvC\right)\)
vậy \(PTK_C=342-178=164\left(đvC\right)\)
b) ta có:
\(3X+PO_4=164\)
\(3X+1.31+4.16=164\)
\(3X+31+64=164\)
\(3X+95=164\)
\(3X=164-95=69\)
\(X=\dfrac{69}{3}=23\left(đvC\right)\)
\(\Rightarrow X\) là \(Na\left(Natri\right)\)
PTK: 27.2 + ( 32.3 + 16.12 ) = 310 đvC
PTK=27.2+32.3+16.12=342 dvC