\(7.6g\)

Theo ĐLBT KL, có: m_CaCO3 = m_CO2 + m_CaO

⇒ m = m_CaO = 10 - 4,4 = 5,6 (kg)

→ Đáp án: C

Bạn tham khảo nhé!

d

BT1:

a, PTHH: Zn + 2HCl -> ZnCl₂ + H₂

Chất tham gia: Zn, HCl

Chất sản phẩm: ZnCl₂, H₂

b, Theo ĐLBTKL, ta có:

\(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ \Rightarrow m_{H_2}=\left(m_{Zn}+m_{HCl}\right)-m_{ZnCl_2}=\left(2,6+8\right)-10=0,2\left(g\right)\)

\(a.\)

\(m_{CaCO_3}=150\cdot80\%=120\left(g\right)\)

\(n_{CaCO_3}=\dfrac{120}{100}=1.2\left(mol\right)\)

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

\(1.2...........1.2\)

\(m_{CaO=}=1.2\cdot56=67.2\left(g\right)\)

\(b.\)

\(n_{CO_2}=\dfrac{27.6}{24}=1.15\left(mol\right)\)

\(n_{CaCO_3}=1.15\left(mol\right)\)

\(m_{CaCO_3}=1.15\cdot100=115\left(g\right)\)

\(m_{TC}=115\cdot20\%=23\left(g\right)\)

a, - Khối lượng CaCO3 trong 150g đá là : 120g

=> \(n_{CaCO3}=\dfrac{m}{M}=1,2\left(mol\right)\)

\(PTHH:CaCO_3\rightarrow CaO+CO_2\)

Theo PTHH : \(n_{CaO}=1,2\left(mol\right)\)

\(\Rightarrow m_{vs}=m_{CaO}=n.M=67,2\left(g\right)\)

b, \(n_{CO2}=\dfrac{V}{24}=1,15\left(mol\right)\)

Theo PTHH : \(n_{CaCO3}=1,15\left(mol\right)\)

\(\Rightarrow m_{CaCO3}=n.M=115\left(g\right)\)

=> %Tạp chất là : \(\left(1-\dfrac{115}{150}\right).100\%=\dfrac{70}{3}\%\)

Vậy ...

CaCO3->CaO+CO2

BTNT

mCaCO3=mCaO+mCO2

mCaO=12-(2,24/22,4).44=7,6g

\(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

PTHH: CaCO₃ --t^o--> CaO + CO₂

                                    0,1<--0,1

=> m_CaO = 0,1.56 = 5,6 (g)

Help me :(

a)

$CaCO_3 \xrightarrow{t^o} CaO + CO_2$
$n_{CaO} = n_{CaCO_3} = \dfrac{150}{100} = 1,5(kmol)$
$m_{CaO} = 1,5.56 = 84(kg)$

b)

$n_{CaO} = n_{CaCO_3\ pư} = 1,5.80\% = 1,2(kmol)$
$m_{CaO} = 1,2.56 = 67,2(kg)$

\(a.PTHH:CaCO_3\underrightarrow{to}CaO+CO_2\\ n_{CaO}=n_{CaCO_3}\\ \rightarrow m_{CaO}=\dfrac{56}{100}.150=84\left(kg\right)\\ b.m_{CaO}=84.80\%=67,2\left(kg\right)\)

Theo ĐLBT KL, có: m_CaCO3 = m_CaO + m_CO2

⇒ m_CO2 = 10 - 5,6 = 4,4 (tấn)