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1. Na + 1/2O2 -> NaO
Al2O3 + 6HCl -> 2AlCl3 + 3H2O
AgNO3 + NaCl -> AgCl + NaNO3
CuSO4 + 2NaOH -> Na2SO4 + Cu(OH)2
\(n_{CaCO_3}=\dfrac{7}{100}=0,07\left(mol\right)\)
\(n_{HCl}=\dfrac{5,475}{36,5}=0,15\left(mol\right)\)
PTHH: CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
Xét \(\dfrac{n_{CaCO_3}}{1}=0,07< \dfrac{n_{HCl}}{2}=0,075\)
=> HCl dư
Do đó, ta có:
PTHH: CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
_______0,075<---0,15__________________________(mol)
=> \(m_{CaCO_3\left(cầnthêm\right)}=\left(0,075-0,07\right).100=0,5\left(g\right)\)
1.
\(4NH_3+5O_2\underrightarrow{^{to}}4NO+6H_2O\)
\(n_{NH3}=\frac{18,816}{22,4}=0,84\left(mol\right)\)
\(n_{O2}=\frac{5}{4}n_{NH3}=\frac{5}{4}.0,84=1,05\left(mol\right)\)
\(\Rightarrow V_{O2}=1,05.22,4=23,52\left(l\right)\)
2.
\(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)
0,3______________________0,3________(mol)
\(n_{CO2}=\frac{6,72}{22,4}=0,3\left(mol\right)\)
\(\Rightarrow m_{CaCO3}=0,3.100\left(g\right)\)
Theo PTHH: \(n_{CaCO_3}=n_{CaO}=n_{CO_2}\)
a) \(n_{CaCO_3}=\dfrac{30}{100}=0,3\left(mol\right)=n_{CaO}=n_{CO_2}\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaO}=0,3\cdot56=16,8\left(g\right)\\V_{CO_2}=0,3\cdot22,4=6,72\left(l\right)\end{matrix}\right.\)
b) Tương tự câu a
c) \(n_{CO_2}=\dfrac{33,6}{22,4}=1,5\left(mol\right)=n_{CaO}=n_{CaCO_3}\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaCO_3}=1,5\cdot100=150\left(g\right)\\m_{CaO}=1,5\cdot56=84\left(g\right)\end{matrix}\right.\)
CaCO3 +2HCl → CaCl2 +CO2 +H2O
+nCO2= \(\dfrac{10,08}{22,4}\)=0,45(mol)
Theo PTHH ta có:
+nCaCO3=0,45(mol)
+nCaCl=0,45(mol)
+mCaCO3=0,45.100=45(gam)
+mCaCl= 0,45 . 75,5 = 33,975(gam)
ta có nCO2=\(\frac{13.44}{22.4}\)=0,6 mol
bt1) Fe2O3+ CO\(\rightarrow\) CO2+Fe
ta có nFe= 0,6 mol
vậy mFe=0,6.56=33,6
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)
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: \(n_{CO_2}=n_{CaCO_3}=n_{CaO}=0,6\left(mol\right)\)
=> \(m_{CaCO_3}=0,6.100=60\left(g\right)\)
\(m_{CaO}=0,6.56=33,6\left(g\right)\)
nCO2=0,1 mol
PTHH: CaCO3+2HCl->CaCl2+H2O+CO2.
Theo phương trình: nCaCO3= nCO2= 0,1 mol.
-> mCaCO3= 0,1 . 100= 10g
nHCl= 0,1 . 2= 0,2 mol
->mHCl= 0,2 . 36.5= 7,3g
nCaCl2=nCO2=0,1 mol
->mCaCl2= 0,1 . 111=11,1g
Bạn tham khảo nha!