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n = 1,5.10^23 : 6.10^23
n= 0,25 (mol)
Zn= 65 (g/mol)
m = n . M
m = 0,25 . 65
m = 16,25(g)
$m_C = 12\ đvC = 1,9926.10^{-23}(gam)$
$\Rightarrow 1\ đvC = \dfrac{1,9926.10^{-23}}{12} = 1,6605.10^{-24}(gam)$
$m_{Zn} = 65\ đvC = 65.1,6605.10^{-24} = 1,079325.10^{-24}(gam)$
\(M_C=12đvC\)\(\Rightarrow1đvC=\dfrac{1,9926\cdot10^{-23}}{12}=1,66\cdot10^{-24}\left(g\right)\)
Ta có: \(M_{Ca}=40đvC\)\(\Rightarrow m_{Ca}=40\cdot1,66\cdot10^{-24}=6,64\cdot10^{-23}\left(g\right)\)
a,\(m_{CuSO_4}=0,25.160=40\left(g\right)\)
b, \(n_{NaCl}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\)
\(m_{NaCl}=0,25.58,5=14,625\left(g\right)\)
a) \(n_{CO2}=\frac{3.10^{23}}{6.10^{23}}=0,5\left(mol\right)\)
=> mCO2 = 0,5 x 32 = 16 gam
b) nCO2 = 22 / 44 = 0,5 (mol)
=> VCO2(đktc) = 0,5 x 22,4 = 11,2 lít
nO2 = 8 / 32 = 0,25 (mol)
=> VO2(đktc) = 0,25 x 22,4 = 5,6 lít
\(n_{Cl_2}=\dfrac{N}{A}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\\ m_{Cl_2}=0,25.71=17,75\left(g\right)\\ V_{Cl_2}=0,25.22,4=5,6\left(l\right)\)
a) \(m_{CuSO_4}=0,3.160=48\left(g\right)\)
b) \(n_{CaCO_3}=\dfrac{9.10^{23}}{6.10^{23}}=1,5\left(mol\right)=>m_{CaCO_3}=1,5.100=150\left(g\right)\)
c) \(n_{MgCl_2}=\dfrac{1,5.10^{22}}{6.10^{23}}=0,025\left(mol\right)=>m_{MgCl_2}=0,025.95=2,375\left(g\right)\)
e) \(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)=>m_{CO_2}=0,1.44=4,4\left(g\right)\)
f) \(n_{NaOH}=\dfrac{0,25.10^{24}}{6.10^{23}}=\dfrac{5}{12}\left(mol\right)=>m_{NaOH}=\dfrac{5}{12}.40=16,667\left(g\right)\)
Nhớ ghi lời giải!
\(n_{Zn}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)\\ m_{Zn}=0,25.65=16,25\left(g\right)\)
thak bn