Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Thành phần % các nguyên tố trong ure:
%H = 100-(%C + %O + %N) = 100- ( 20 + 26,7 + 46,7) = 6,6%
a) \(M_{\left(NH_2\right)_2CO}=\left(14.1+1.2\right).2+12.1+16.1=60\left(g/mol\right)\)
b) \(\left\{{}\begin{matrix}\%N=\dfrac{2.14}{60}.100\%=46,67\%\\\%H=\dfrac{1.4}{60}.100\%=6,67\%\\\%C=\dfrac{12.1}{60}.100\%=20\%\\\%O=100\%-46,67\%-6,67\%-20\%=26,66\%\end{matrix}\right.\)
\(a.\%m_N=\dfrac{14.2}{\left(14+4.1\right).2+32+4.16}.100\approx21,212\%\\ \%m_H=\dfrac{4.2}{\left(14+4.1\right).2+32+4.16}.100\approx6,061\%\\ \%m_S=\dfrac{32}{\left(14+4.1\right).2+32+4.16}.100\approx24,242\%\\ \%m_O=\dfrac{4.16}{\left(14+4.1\right).2+32+4.16}.100\approx48,485\%\)
\(b.m_{N\left(20kg\right)}=20.\dfrac{2.14}{\left(14+4.1\right).2+32+4.16}.100\%\approx4,2424\left(kg\right)\)
Câu 2:
Trong 1 mol X: \(\left\{{}\begin{matrix}n_{Ag}=\dfrac{170.63,53\%}{108}=1\left(mol\right)\\n_N=\dfrac{170.8,23\%}{14}=1\left(mol\right)\\n_O=\dfrac{170\left(100\%-63,53\%-8,23\%\right)}{16}=3\left(mol\right)\end{matrix}\right.\)
Vậy CTHH của X là \(AgNO_3\)
Câu 1:
\(a,\%_{Fe}=\dfrac{56}{180}\cdot100\%=31,11\%\\ \%_N=\dfrac{14\cdot2}{180}\cdot10\%=15,56\%\\ \%_O=100\%-31,11\%-15,56\%=53,33\%\\ b,\%_{N\left(N_2O\right)}=\dfrac{14\cdot2}{44}\cdot100\%=63,63\%\\ \%_{O\left(N_2O\right)}=100\%-63,63\%=36,37\%\\ \%_{N\left(NO\right)}=\dfrac{14}{30}\cdot100\%=46,67\%\\ \%_{O\left(NO\right)}=100\%-46,67\%=53,33\%\\ \%_{O\left(NO_2\right)}=\dfrac{16\cdot2}{46}\cdot100\%=69,57\%\\ \%_{N\left(NO_2\right)}=100\%-69,57\%=30,43\%\)
\(m_{Fe}=180.31,11\%=56\left(g\right)\\ m_N=180.15,56\%=28\left(g\right)\\ m_O=180-56-28=96\left(g\right)\)
\(n_{Fe}=\dfrac{56}{56}=1\left(mol\right)\\ n_N=\dfrac{28}{14}=2\left(mol\right)\\ n_O=\dfrac{96}{16}=6\left(mol\right)\)
\(CTHH:Fe\left(NO_3\right)_2\)
(đề lỗi nên mik sửa Bari thành Sắt nhé chứ Bari nặng tới 137 g/mol)
Gọi CTHH là CaxCyOz
Trong hợp chất: mCa = 100.40% = 40 (g) => x = 1
mC = 100.12% = 12 => y = 1
mO =100.48% = 48 => z = 3
=> Hợp chất là CaCO3
\(PTK_{KNO_3}=101\left(đvC\right)\\ \Leftrightarrow\left\{{}\begin{matrix}\%_K=\dfrac{39}{101}\cdot100\%=38,61\%\\\%_N=\dfrac{14}{101}\cdot100\%=13,86\%\\\%_O=100\%-38,61\%-13,86\%=47,53\%\end{matrix}\right.\)
Trong hợp chất:
\(\left\{{}\begin{matrix}m_{Cu}=80\cdot80\%=64\left(g\right)\\m_O=80\cdot20\%=16\left(g\right)\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}n_{Cu}=\dfrac{64}{64}=1\left(mol\right)\\n_O=\dfrac{16}{16}=1\left(mol\right)\end{matrix}\right.\)
Vậy CTHH A là \(CuO\)
a, 60(g/mol)
b,phần trăm khối lượng N là: 14:(12+16+(14+2).2).100%= 23,3%