Phương trình hóa học CaCO3 → CaO + CO2.

a) nCaO =  = 0,2 mol.

Theo PTHH thì nCaCO3 = nCaO = 0,2 (mol)

b) nCaO =  = 0,125 (mol)

Theo PTHH thì nCaCO3 = nCaO = 0,125 (mol)

mCaCO3 = M.n = 100.0,125 = 12,5 (g)

c) Theo PTHH thì nCO2 = nCaCO3 = 3,5 (mol)

VCO2 = 22,4.n = 22,4.3,5 = 78,4 (lít)

d) nCO2 =  = 0,6 (mol)

Theo PTHH nCaO = nCaCO3 = nCO2 = 0,6 (mol)

mCaCO3 = n.M = 0,6.100 = 60 (g)

mCaO = n.M = 0,6.56 = 33,6 (g)

Phương trình hóa học CaCO\(_3\) → CaO + CO\(_2\).

a) nCaO = \(\frac{11,2}{56}\) = 0,2 mol.

Theo PTHH thì nCaCO\(_3\) = nCaO = 0,2 (mol)

b) nCaO = \(\frac{7}{56}\) = 0,125 (mol)

Theo PTHH thì nCaCO\(_3\) = nCaO = 0,125 (mol)

mCaCO\(_3\) = M.n = 100.0,125 = 12,5 (g)

c) Theo PTHH thì nCO\(_2\) = nCaCO\(_3\) = 3,5 (mol)

VCO\(_2\) = 22,4.n = 22,4.3,5 = 78,4 (lít)

d) nCO\(_2\) = \(\frac{13,44}{22,4}\) = 0,6 (mol)

Theo PTHH nCaO = nCaCO\(_3\) = nCO\(_2\) = 0,6 (mol)

mCaCO\(_3\) = n.M = 0,6.100 = 60 (g)

mCaO = n.M = 0,6.56 = 33,6 (g)

                                   #shin

PTHH : CaCO₃ --> Cao + CO₂

a, n_CaO = \(\frac{11,2}{56}=0,2\left(mol\right)\)

Theo PTHH : n_CaO = n_CaCO3 = 0,2 mol

Vậy : Cần dùng 0,2 mol  CaCO₃ để điều chế đc 11,2 g CaO

b, Mấy câu sau dễ tự làm

a) \(n_{CaO}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

Ta có: \(n_{CaCO_3}=n_{CaO}=0,2\left(mol\right)\)

b) \(n_{CaO}=\dfrac{7}{56}=0,125\left(mol\right)\)

Ta có :  \(n_{CaCO_3}=n_{CaO}=0,125\left(mol\right)\)

=> \(m_{CaCO_3}=0,125.100=12,5\left(g\right)\)

c) \(n_{CO_2}=n_{CaCO_3}=3,5\left(mol\right)\)

=> \(V_{CO_2}=3,5.22,4=78,4\left(lít\right)\)

d) \(n_{CO_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)

Ta có: \(n_{CO_2}=n_{CaCO_3}=n_{CaO}=0,6\left(mol\right)\)

=> \(m_{CaCO_3}=0,6.100=60\left(g\right)\)

\(m_{CaO}=0,6.56=33,6\left(g\right)\)

a) \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)

PTHH: 3Fe + 2O₂ --t^o--> Fe₃O₄

            0,03<-0,02<------0,01

=> m_Fe = 0,03.56 = 1,68 (g)

b) V_O2 = 0,02.22,4 = 0,448 (l)

PTHH: \(2KMnO_4\xrightarrow[]{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)

Ta có: \(n_{KMnO_4}=2n_{O_2}=2\cdot\dfrac{5,6}{22,4}=0,5\left(mol\right)\)

\(\Rightarrow m_{KMnO_4}=0,5\cdot158=79\left(g\right)\)

\(n_{0_{2}}=\dfrac{2,8}{22,4}=0,125(mol)\)

\(PTHH: 2KMnO_{4} ->K_{2}MNO_{4}+MnO_{2}+O_{2} \)

\(m_{KMnO_{4}}=0,25.158=39,5(g)\)

\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ PTHH:2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)

Theo pt: \(n_{KMnO_4}=2n_{O_2}=0,5\left(mol\right)\Rightarrow m_{KMnO_4}=n\cdot M=0,5\cdot158=79\left(g\right)\)

n_Fe3O4 = 2,32/232 = 0,01 mol

3Fe  +  2O₂ ➝ Fe₃O₄

 0,03    0,02      0,01    (mol)

a) m_Fe = 0,03.56 = 1,68 gam

b) V_O2 = 0,02.22,4 = 0,448 lít

PTHH: \(3Fe+2O_2\xrightarrow[]{t^o}Fe_3O_4\)

Ta có: \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,02\left(mol\right)\\n_{Fe}=0,03\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe}=0,03\cdot56=1,68\left(g\right)\\V_{O_2}=0,02\cdot22,4=0,448\left(l\right)\end{matrix}\right.\)

PTHH: \(3Fe+2O_2\xrightarrow[]{t^o}Fe_3O_4\)

Ta có; \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{Fe}=0,03\left(mol\right)\\n_{O_2}=0,02\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe}=0,03\cdot56=1,68\left(g\right)\\V_{O_2}=0,02\cdot22,4=0,448\left(l\right)\end{matrix}\right.\)

2KMNO4-to>K2MnO4+MnO2+O2

0,5-------------------------------------0,25

n O2=0,25 mol

=>m KMnO4=0,4.158=63,2g