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\(\%Al=\dfrac{27}{27+62.3}.100=12,68\%\)
\(\%N=\dfrac{14.3}{27+62.3}.100=19,72\%\)
\(\%O=\dfrac{16.9}{27+62.3}.100=67,6\%\)
1,a,Gọi \(n_{Al}=a\left(mol\right)\rightarrow n_{Mg}=0,5a\left(mol\right)\)
\(\rightarrow27a+24.0,5b=7,8\\ \Leftrightarrow a=0,2\left(mol\right)\\ \rightarrow\left\{{}\begin{matrix}n_{Al}=0,2\left(mol\right)\\n_{Mg}=0,1\left(mol\right)\end{matrix}\right.\)
b, \(\rightarrow\left\{{}\begin{matrix}m_{Al}=0,2.27=5,4\left(g\right)\\m_{Mg}=0,1.24=2,4\left(g\right)\end{matrix}\right.\)
2, \(n_{O_2}=\dfrac{0,16}{32}=0,005\left(mol\right)\)
PTHH: 2HgO --to--> 2Hg + O2
0,01<- 0,05
\(\rightarrow m_{Hg}=0,01.201=2,01\left(g\right)\)
\(M_{MgSO_4}=24+32+16.4=120\\ \%Mg=\dfrac{24}{120}.100=20\%\\ \%S=\dfrac{32}{120}.100=26,67\%\\ \%O=\dfrac{16.4}{120}.100=53,33\%\\ M_{Al\left(NO_3\right)_3}=27+62.3=213\\ \%Al=\dfrac{27}{213}.100=12,68\%\\ \%N=\dfrac{14.3}{213}.100=19,72\%\\ \%O=\dfrac{16.9}{213}.100=67,6\%\)
\(MgSO_4=120\)
\(\%Mg=\dfrac{24}{120}.100\%=20\%\)
\(\%S=\dfrac{32}{120}.100\%\text{≈}26,67\%\)
\(\%O=100-\left(20+26,67\right)\text{≈}53,33\%\)
a)
$n_{NO_3} = n_N = \dfrac{241,6.12,748\%}{14} = 2,2(mol)$
$m_{kim\ loại} = m_A - m_{NO_3} = 241,6 - 2,2.62 = 105,2(gam)$
b)
Gọi $n_{XNO_3} = 5a(mol) ; n_{Y(NO_3)_2} = 3a(mol)$
Ta có :
$n_N = 5a + 3a.2 = 2,2 \Rightarrow a = 0,2(mol)$
Suy ra: $0,2.5.(X + 62) + 0,2.3(Y + 62.2) = 241,6$
$\Rightarrow 5X + 3Y = 526$
Với X = 23(Natri) Y = 137 (Bari) Thì thỏa mãn
\(m_{tăng}=m_{O_2}=7.2\left(g\right)\)
\(n_{O_2}=\dfrac{7.2}{32}=0.225\left(mol\right)\)
\(V_{kk}=5V_{O_2}=5\cdot0.225\cdot22.4=25.2\left(l\right)\)
\(Đặt:n_{Mg}a\left(mol\right),n_{Cu}=b\left(mol\right),n_{Al}=c\left(mol\right)\)
\(Mg+\dfrac{1}{2}O_2\underrightarrow{t^0}MgO\)
\(Cu+\dfrac{1}{2}O_2\underrightarrow{t^0}CuO\)
\(4Al+3O_2\underrightarrow{t^0}2Al_2O_3\)
\(TC:n_{O_2}=0.5a=0.5b=0.75c=\dfrac{0.225}{3}=0.075\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}a=0.15\\b=0.15\\c=0.1\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Mg}=0.15\cdot24=3.6\left(g\right)\\m_{Cu}=0.15\cdot64=9.6\left(g\right)\\m_{Al}=0.1\cdot27=2.7\left(g\right)\end{matrix}\right.\)
\(n_{NO_3} = n_N = \dfrac{52,39.14,43\%}{14} = 0,54(mol)\\ m_A = m_{kim\ loại} + m_{NO_3}\\ \Rightarrow m_{kim\ loại} = m_A - m_{NO_3} = 52,39 - 0,54.62 = 18,91(gam)\)
Sao nNO3 lại bằng nN ạ?