Hãy tính khối lượng bằng gam của các n/tố Al, Fe, Cu, F, C, Mg, S.
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mFe= 0,16605.10-23.56=9,2988.10-23 (g)
mCu=0,16605.10-23.64=10,6272.10-23(g)
mMg=0,16605.10-23.24=3,9852.10-23(g)
mZn=0,16605.10-23.65=10,79325.10-23(g)
mO2=0,16605.10-23.32=5,3136.10-23(g)
mN2=0,16605.10-23.28=4,6494.10-23(g)
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
\(m_{Ca}=0,16605\times10^{-23}\times40=6,642\times10^{-23}\left(g\right)\)
\(m_{Mg}=0,16605\times10^{-23}\times24=3,9852\times10^{-23}\left(g\right)\)
\(m_{Al}=0,16605\times10^{-23}\times27=4,48335\times10^{-23}\left(g\right)\)
\(m_{Fe}=0,16605\times10^{-23}\times56=9,2988\times10^{-23}\left(g\right)\)
\(m_{Na}=0,16605\times10^{-23}\times23=3,81915\times10^{-23}\left(g\right)\)
\(m_O=0,16605\times10^{-23}\times16=2,6568\times10^{-23}\left(g\right)\)
\(m_S=0,16605\times10^{-23}\times32=5,3136\times10^{-23}\left(g\right)\)
\(m_N=0,16605\times10^{-23}\times14=2,3247\times10^{-23}\left(g\right)\)
\(m_{Cl}=0,16605\times10^{-23}\times35,5=5,894775\times10^{-23}\left(g\right)\)
\(M_{Mg}=\dfrac{3,98\times10^{-23}}{0,16605\times10^{-23}}=24\left(g\right)\)
\(M_{Fe}=\dfrac{9,2988\times10^{-23}}{0,16605\times10^{-23}}=56\left(g\right)\)
\(M_{Cu}=\dfrac{106,3\times10^{-24}}{0,16605\times10^{-23}}=64\left(g\right)\)
\(M_{Al}=\dfrac{4,48\times10^{-23}}{0,16605\times10^{-23}}=27\left(g\right)\)
Phần khối lượng của Fe đề sai rồi phải là \(9,2988\times10^{-23}\) mới đúng
a.
\(m_K=39\cdot1.66\cdot10^{-24}=6.474\cdot10^{-23}\left(g\right)\)
\(m_{Zn}=65\cdot1.66\cdot10^{-24}=1.079\cdot10^{-22}\left(g\right)\)
\(m_{Cu}=64\cdot1.66\cdot10^{-24}=1.0624\cdot10^{-22}\left(g\right)\)
\(m_{Mg}=24\cdot1.66\cdot10^{-24}=3.984\cdot10^{-23}\left(g\right)\)
b.
\(m_{Na_2O}=62\cdot1.66\cdot10^{-24}=1.0292\cdot10^{-22}\left(g\right)\)
\(m_{CaO}=56\cdot1.66\cdot10^{-24}=9.296\cdot10^{-23}\left(g\right)\)
\(m_{FeCl_2}=127\cdot1.66\cdot10^{-24}=2.1082\cdot10^{-22}\left(g\right)\)
\(m_{Al_2O_3}=102\cdot1.66\cdot10^{-24}=1.6932\cdot10^{-22}\left(g\right)\)
a) Khối lượng tính bằng gam của:
\(m_K=0,16605.10^{-23}.39=6,47595.10^{-23}\left(g\right)\)
\(m_{Zn}=0,16605.10^{-23}.65=10,79325.10^{-23}\left(g\right)\\ m_{Cu}=0,16605.10^{-23}.64=10,6272.10^{-23}\left(g\right)\\ m_{Mg}=0,16605.10^{-23}.24=3,9852.10^{-23}\left(g\right)\)
b) Khối lượng tính bằng gam của các phân tử:
\(m_{Na_2O}=62.0,16605.10^{-23}=10,2951.10^{-23}\left(g\right)\\ m_{CaO}=56.0,16605.10^{-23}=9,2988.10^{-23}\left(g\right)\\ m_{FeCl_2}=127.0,16605.10^{-23}=21,08835.10^{-23}\left(g\right)\\ m_{Al_2O_3}=102.0,16605.10^{-23}=16,9371.10^{-23}\left(g\right)\)
\(n_{Fe}=a\left(mol\right),n_{Al}=b\left(mol\right)\)
\(m_{hh}=56a+27b=22.2\left(g\right)\left(1\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(n_{H_2}=a+1.5b=0.6\left(mol\right)\left(2\right)\)
\(\left(1\right),\left(2\right):a=0.3,b=0.2\)
\(\%Fe=\dfrac{0.3\cdot56}{22.2}\cdot100\%=75.67\%\)
\(\%Al=24.33\%\)
Gọi $n_{Fe} = a ; n_{Al} = b$
$\Rightarrow 56a + 27b = 22,2(1)$
$Fe + H_2SO_4 \to FeSO_4 + H_2$
$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
Theo PTHH :
$n_{H_2} = a + 1,5b = 0,6(2)$
Từ (1)(2) suy ra a = 0,3; b = 0,2
$\%m_{Fe} = \dfrac{0,3.56}{22,2}.100\% =75,68\%$
$\%m_{Al} = 24,32\%$