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\(n_{Cu\left(NO_3\right)_2}=\dfrac{15.04}{188}=0.08\left(mol\right)\)
\(n_{O_2}=x\left(mol\right)\)
\(2Cu\left(NO_3\right)_2\underrightarrow{t^0}2CuO+4NO_2+O_2\)
\(2x......................4x......x\)
\(BTKL:\)
\(m_{NO_2}+m_{O_2}=15.04-8.56=6.48\left(g\right)\)
\(\Rightarrow4x\cdot46+32x=6.48\)
\(\Rightarrow x=0.03\)
\(\%Cu\left(NO_3\right)_{2\left(ph\right)}=\dfrac{0.03}{0.08}\cdot100\%=37.5\%\)
\(b.\)
\(\overline{M}=\dfrac{6.48}{0.12+0.03}=43.2\left(\dfrac{g}{mol}\right)\)
\(d_{\dfrac{hh}{H_2}}=\dfrac{43.2}{2}=21.6\)
\(c.\)
\(H\%=\dfrac{0.03}{0.08}\cdot100\%=37.5\%\)
\(\)
\(PTHH:Mg+H_2SO_4--->MgSO_4+H_2\uparrow\)
Áp dụng ĐLBTKL, ta có:
\(m_{Mg}+m_{H_2SO_4}=m_{MgSO_4}+m_{H_2}\)
\(\Leftrightarrow9,6+39,2=m_{MgSO_4}+0,8\)
\(\Leftrightarrow m_{MgSO_4}=9,6+39,2-0,8=48\left(g\right)\)
a) Mg + 2HCl --> MgCl2 + H2
b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2
0,3<--0,15<--0,15
=> mHCl = 0,3.36,5 = 10,95 (g)
c) mMgCl2 = 0,15.95 = 14,25 (g)
a) 2Mg + O2 --to--> 2MgO
b) \(m_{MgO}=2,4.1,667=4\left(g\right)\)
Theo ĐLBTKL: mMg + mO2 = mMgO
=> mO2 = 4-2,4 = 1,6(g)
a) Mg + 2HCl --> MgCl2 + H2
b) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2
0,2-->0,4----->0,2---->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
c) mHCl = 0,4.36,5 = 14,6 (g)
d)
C1: mMgCl2 = 0,2.95 = 19 (g)
C2:
Theo ĐLBTKL: mMg + mHCl = mMgCl2 + mH2
=> mMgCl2 = 4,8 + 14,6 - 0,2.2 = 19 (g)
a, \(n_{Mg}=\dfrac{4,8}{24}=0,2mol\)
\(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(V_{H_2}=0,2.22,4=4,48l\)
\(n_{HCl}=0,2.2=0,4mol\)
\(m_{HCl}=0,4.36,5=14,6g\)
\(m_{MgCl_2}=0,2.95=19g\)
a: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(n_{Mg}=\dfrac{4.8}{24}=0.2\left(mol\right)\)
b: \(n_{H_2}=n_{Mg}=0.2\left(mol\right)\)
\(\Leftrightarrow V_{H_2}=0.2\cdot22.4=4.48\left(lít\right)\)
\(n_{HCl}=2\cdot0.2=0.4\left(mol\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(m_{MgCl_2}=0.2\cdot95=19\left(g\right)\)
a) Mg + 2AgNO3 → Mg(NO3)2 + 2Ag↓
b) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
Theo PT: \(n_{AgNO_3}=2n_{Mg}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{AgNO_3}=0,4\times170=68\left(g\right)\)
Theo PT: \(n_{Mg\left(NO_3\right)_2}=n_{Mg}=0,2\left(mol\right)\)
\(\Rightarrow m_{Mg\left(NO_3\right)_2}=0,2\times148=29,6\left(g\right)\)