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a) mCuSO4= n * M = 0.5 * 160 = 80 (g)
b) mO= n * M = 1.75 * 16 = 28 (g)
c) mH2 = n * M = 2.5 * 2 = 5 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.n_{H_2}=\dfrac{1,2.10^{23}}{6.10^{23}}=0,2\left(mol\right)\\ n_{SO_2}=\dfrac{6,4}{64}=0,1\left(mol\right)\\ V_X=\left(1,5+2,5+0,2+0,1\right).22,4=96,32\left(l\right)\\b. m_X=1,5.32+2,5.28+0,2.2+6,4=124,8\left(g\right)\)
a.nH2=1,2.10236.1023=0,2(mol)nSO2=6,464=0,1(mol)VX=(1,5+2,5+0,2+0,1).22,4=96,32(l)b.mX=1,5.32+2,5.28+0,2.2+6,4=124,8(g)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_P=\dfrac{m}{M}=\dfrac{12,4}{31}=0,4\left(mol\right)\)
\(n_{O_2}=\dfrac{m}{M}=\dfrac{19,2}{32}=0,6\left(mol\right)\)
\(4P+5O_2\rightarrow^{t^0}2P_2O_5\)
4 : 5 : 2 (mol)
0,4 : 0,6 (mol)
-Lập tỉ lệ: \(\dfrac{0,4}{4}< \dfrac{0,6}{5}\Rightarrow\)O2 phản ứng hết còn P dư.
\(n_{P\left(lt\right)}=\dfrac{0,4.5}{4}=0,5\left(mol\right)\)
\(n_{P\left(dư\right)}=n_{P\left(tt\right)}-n_{P\left(lt\right)}=0,6-0,5=0,1\left(mol\right)\)
b. \(n_{P_2O_5}=\dfrac{0,4.2}{4}=0,2\left(mol\right)\)
\(\Rightarrow m_{P_2O_5}=n.M=0,2.142=28,4\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(n_{N_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
b) \(n_{SO_2}=\dfrac{6,4}{64}=0,1\left(mol\right)\)
c) \(n_{Fe}=\dfrac{3.10^{23}}{6.10^{23}}=0,5\left(mol\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(PTK_{CuSO_x}=NTK_{Cu}+NTK_S+x\cdot NTK_O=160\\ \Rightarrow64+32+16x=160\\ \Rightarrow16x=64\\ \Rightarrow x=4\\ \Rightarrow A\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{H_2SO_4}=\dfrac{98}{98}=1\) (mol)
\(n_{CuSO_4}=\dfrac{120}{160}=0,75\) (mol)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
\(1,M_{MgCO_3}=84(g/mol)\\ \begin{cases} \%_{Mg}=\dfrac{24}{84}.100\%=28,57\%\\ \%_{C}=\dfrac{12}{84}.100\%=14,29\%\\ \%_{O}=100\%-28,57\%-14,29\%=57,14\% \end{cases}\)
\(2,M_{Al(OH)_3}=78(g/mol)\\ \begin{cases} \%_{Al}=\dfrac{27}{78}.100\%=31,62\%\\ \%_{H}=\dfrac{3}{78}.100\%=3,85\%\\ \%_{O}=100\%-31,62\%-3,85\%=64,53\% \end{cases}\)
\(3,M_{(NH_4)_2HPO_4}=132(g/mol)\\ \begin{cases} \%_{N}=\dfrac{28}{132}.100\%=21,21\%\\ \%_{H}=\dfrac{9}{132}.100\%=6,82\%\\ \%_{P}=\dfrac{31}{132}.100\%=23,48\%\\ \%_{O}=100\%-23,48\%-6,82\%-21,21\%48,49\% \end{cases}\)
\(4,M_{C_2H_5COOCH_3}=88(g/mol)\\ \begin{cases} \%_{C}=\dfrac{48}{88}.100\%=54,55\%\\ \%_{H}=\dfrac{8}{88}.100\%=9,09\%\\ \%_{O}=100\%-9,09\%-54,55\%=36,36\% \end{cases}\)
Bài 2:
\(c,\%_{Al(AlCl_3)}=\dfrac{27}{27+35,5.3}.100\%=20,22\%\\ \%_{Al(Al_2O_3)}=\dfrac{27.2}{27.2+16.3}.100\%=52,94\%\\ \%_{Al(AlBr_3)}=\dfrac{27}{27+80.3}.100\%=10,11\%\\ \%_{Al(Al_2S_3)}=\dfrac{27.2}{27.2+32.3}.100\%=36\%\)
Vậy \(Al_2O_3\) có \(\%Al\) cao nhất và \(AlBr_3\) có \(\%Al\) nhỏ nhất
![](https://rs.olm.vn/images/avt/0.png?1311)
Khối lượng của C u S O 4 : m = n.M = 0,15.160 = 24 (gam)