Bài 3 : 

$n_{CaO} = \dfrac{168}{56} = 3(kmol)$
$CaCO_3 \xrightarrow{t^o} CaO + CO_2$
$n_{CaCO_3\ pư} = n_{CaO} = 3(kmol)$
$n_{CaCO_3\ đã\ dùng} = \dfrac{3}{80\%} = 3,75(kmol)$

$m_{CaCO_3} = 3,75.100 = 375(kg)$
$m = \dfrac{375}{80\%} = 468,75(kg)$

Bài 2 : 

\(m_{CaCO_3}=280\cdot75\%=210\left(kg\right)\)

\(n_{CaCO_3\left(pư\right)}=\dfrac{210}{100}\cdot80\%=1.68\left(kmol\right)\)

\(CaCO_3\underrightarrow{^{^{t^0}}}CaO+CO_2\)

\(1.68.........1.68......1.68\)

\(m_{CaO}=1.68\cdot56=94.08\left(kg\right)\)

\(V_{CO_2}=1.68\cdot22.4=37.632\left(l\right)=0.037632\left(m^3\right)\)

Bài 4 : 

$n_C = n_{CO_2} = \dfrac{4,48}{22,4} = 0,2(mol)$
$n_H = 2n_{H_2O} = 2.\dfrac{5,4}{18} = 0,6(mol)$
$\Rightarrow n_O = \dfrac{4,6 - 0,2.12 - 0,6}{16} = 0,1(mol)$
$n_C : n_H : n_O = 0,2 : 0,6 : 0,1 = 2 : 6 : 1$

Vậy CTPT có dạng $(C_2H_6O)_n$

Ta có:  $M_A = 46n = 1,586.29 \Rightarrow n = 1$

Vậy CTPT là $C_2H_6O$

\(m_{CaO\left(lt\right)}=\dfrac{94,08}{80\%}\cdot100\%=117,6kg\\ CaCO_3\xrightarrow[]{t^0}CaO+CO_2\\ \Rightarrow\dfrac{m_{CaCO_3}}{100}=\dfrac{117,6}{56}\\ \Rightarrow m_{CaCO_3}=210kg\\ \%m_{CaCO_3\left(trong.đá.vôi\right)}=\dfrac{210}{280}\cdot100\%=75\%\)

PT: \(CaCO_3\underrightarrow{t^o}CaO+CO_2\)

Ta có: \(n_{CaO}=\dfrac{94,08}{56}=1,68\left(kmol\right)\)

Theo PT: \(n_{CaCO_3\left(LT\right)}=n_{CaO}=1,68\left(kmol\right)\)

Mà: H = 80%
\(\Rightarrow n_{CaCO_3\left(TT\right)}=\dfrac{1,68}{80\%}=2,1\left(mol\right)\)

\(\Rightarrow m_{CaCO_3\left(TT\right)}=2,1.100=210\left(kg\right)\)

\(\Rightarrow\%CaCO_3=\dfrac{210}{280}.100\%=75\%\)

 \(a.m_{CaCO_3}=\left(100\%-10\%\right).2=1,8\left(tấn\right)\\ PTHH:CaCO_3\underrightarrow{to}CaO+CO_2\\ n_{CaO\left(LT\right)}=n_{CaCO_3}\\ \rightarrow m_{CaO\left(LT\right)}=\dfrac{1,8.56}{100}=1,008\left(tấn\right)\\ \rightarrow m_{CaO\left(TT\right)}=1,008.85\%=0,8568\left(tấn\right)\\ b.m_{CaCO_3\left(LT\right)}=\dfrac{280.100}{56}=500\left(kg\right)\\ m_{CaCO_3\left(TT\right)}=500:75\%=\dfrac{2000}{3}\left(kg\right)\\ m_{đá-vôi}=\dfrac{2000}{3}:90\%\approx740,741\left(kg\right)\)

PTHH: CaCO₃ →t^o→CaO +CO₂

+n_CaO=n_CO2=0,9(mol)

+m_CaO=0,9.56=50,4(gam)

Hiệu suất pư là : \(\dfrac{50,4}{100}=0,504\)

Khối lượng  C a C O 3  nguyên chất:

⇒ Chọn C.

\(m_{CaCO_3\left(nguyênchất\right)}=1500000.\left(100\%-5\%\right)=1425000\left(g\right)\)

\(\Rightarrow n_{CaCO_3}=\dfrac{1425000}{100}=14250\left(mol\right)\)

PTHH: CaCO₃ ---t^o→ CaO + CO₂

Mol:      14250               14250

\(m_{CaO}=14250.40=570000\left(g\right)=0,57\left(tấn\right)\)

Câu 1:

\(m_{CaO(\text {phản ứng})}=\dfrac{50,4}{90\%}=56(g)\\ \Rightarrow n_{CaO}=\dfrac{56}{56}=1(mol)\\ PTHH:CaCO_3\xrightarrow{t^o}CaO+CO_2\\ \Rightarrow n_{CaCO_3}=1(mol)\\ \Rightarrow m_{CaCO_3}=100.1=100(g)\\ \Rightarrow m_{\text {đá vôi}}=\dfrac{100}{90\%}\approx 111,11(g)\)

A.

1)

1,2 tấn = 1200(kg)

5 tạ = 500(kg)

mCaCO3=1200.80%=960(kg)mCaCO3=1200.80%=960(kg)

\(m_{\text{CaCO_3}}=1000.95\%=950kg\\ \rightarrow n_{\text{CaCO_3}}=9,5mol\)

\(m_{CaCO_3}\underrightarrow{t^o}CaO+CO_2\)

9,5            →   9,5

\(\rightarrow V_{CO_2}=9,5.22,4=212,8\)

→  hiệu suất phản ứng là

\(\dfrac{159,6}{212,8}.100=75\%\)