a)

\(4FeS_2 + 11O_2 \xrightarrow{t^o} 2Fe_2O_3 + 4SO_2\\ 2SO_2 + O_2 \xrightarrow{t^o,V_2O_5} 2SO_3\\ SO_3 + H_2O \to H_2SO_4\)

b)

\(m_{FeS_2} = 1000.60\% = 600(kg)\\ n_{FeS_2} = \dfrac{600}{120} = 5(kmol)\\ \Rightarrow n_{FeS_2\ pư} = 5.80\% = 4(kmol)\)

Bảo toàn nguyên tố với S : \(n_{H_2SO_4} = 2n_{FeS_2} = 4.2 = 8(kmol)\)

Suy ra :

\(m_{H_2SO_4} = 8.98 = 784(kg)\\ \Rightarrow m_{dd\ H_2SO_4} = \dfrac{784}{98\%} =800(kg)\)

Đáp án C.

FeS₂→ 2H₂SO₄

0,08    ← 0,16   (mol)

H% = 0,08.100/0,1= 80%

\(m_{FeS_2}=\dfrac{1.60}{100}=0,6\left(tấn\right)\)

=> \(m_{FeS_2\left(pư\right)}=\dfrac{0,6.80}{100}=0,48\left(tấn\right)\)

Cứ 1 mol FeS₂ điều chế được 2 mol H₂SO₄

=> 120g FeS₂ điều chế được 196g H₂SO₄

=> 0,48 tấn FeS₂ điều chế được 0,784 tấn H₂SO₄

=> \(m_{ddH_2SO_4}=\dfrac{0,784.100}{98}=0,8\left(tấn\right)\)

\(m_{FeS_2}=0.6\left(tấn\right)=0.6\cdot10^3\left(kg\right)\)

\(n_{FeS_2}=\dfrac{0.6\cdot10^3}{120}=\dfrac{10^3}{200}\left(kmol\right)\)

Dựa vào sơ đồ phản ứng : 

\(n_{H_2SO_4}=2n_{FeS_2}=2\cdot\dfrac{10^3}{200}=\dfrac{10^3}{100}=10\left(kmol\right)\)

\(m_{H_2SO_4\left(tt\right)}=10\cdot\dfrac{98}{80\%}=1225\left(kg\right)\)

\(m_{dd_{H_2SO_4}}=\dfrac{1225}{98\%}=1250\left(kg\right)=12.5\left(tấn\right)\)

m(FeS2)=(100%-20%).1=0,8(tấn)

4 FeS2 + 11 O2 -to,xt-> 2 Fe2O3 + 8 SO2

\(mSO2\left(LT\right)=\dfrac{0,8.512}{480}=\dfrac{64}{75}\left(tấn\right)\\ \rightarrow mSO2\left(TT\right)=\dfrac{64}{75}.90\%=\dfrac{96}{125}\left(tấn\right)\)

SO2 + 1/2 O2 \(⇌\) SO3

\(mSO3\left(LT\right)=\dfrac{\dfrac{96}{125}.80}{64}=\dfrac{24}{25}\left(tấn\right)\\ mSO3\left(TT\right)=\dfrac{24}{25}.64\%=\dfrac{384}{625}\left(tấn\right)\)

SO3+ H2O -> H2SO4

\(mH2SO4\left(LT\right)=\dfrac{\dfrac{384}{625}.98}{80}=\dfrac{2352}{3125}\left(tấn\right)\\ mH2SO4\left(TT\right)=\dfrac{2352}{3125}.80\%=\dfrac{9408}{15625}\left(tấn\right)\)

=> \(mddH2SO4\left(72\%\right)=\dfrac{\dfrac{9408}{15625}.100}{72}=0,836\left(tấn\right)\)

m(FeS2)=(100%-20%).1=0,8(tấn)

4 FeS2 + 11 O2 -to,xt-> 2 Fe2O3 + 8 SO2

SO3+ H2O -> H2SO4

mddH2SO4(72%)=940815625.10072=0,836(tấn)

4FeS₂ + 11O₂ --t^o--> 2Fe₂O₃ + 8SO₂

=> Tổng hệ số chất sản phẩm là: 2+8 = 10

a)

$4FeS_2 + 11O_2 \xrightarrow{t^o} 2Fe_2O_3 + 8SO_2$
$2SO_2 + O_2 \xrightarrow{t^o,xt} 2SO_3$
$SO_3 + H_2O \to H_2SO_4$

b)

$m_{FeS_2} = 1000.60\% = 600(kg)$
$n_{FeS_2} = \dfrac{600}{120} = 5(kmol)$
$n_{FeS_2\ pư} = 5.80\% = 4(kmol)$

$n_{H_2SO_4} = 2n_{FeS_2} = 8(kmol)$
$m_{H_2SO_4} = 8.98 = 784(kg)$

b)

mFeS2=1000.60%=600(kg)

mFeS2=1000.60%=600(kg)
nFeS2=600120=5(kmol)
nFeS2 pư=5.80%=4(kmol)

nFeS2 pư=5.80%=4(kmol)

nH2SO4=2nFeS2=8(kmol)

nH2SO4=2nFeS2=8(kmol)
mH2SO4=8.98=784(kg)

\(n_{Fe} = \dfrac{5000.1000}{56} = \dfrac{625000}{7}\ kmol\\ n_{FeS_2\ đã\ dùng} = \dfrac{n_{Fe}}{H\%} = \dfrac{\dfrac{625000}{7}}{89,6\%} = 99649,23\ kmol\\ m_{quăng\ pirit} = \dfrac{m_{FeS_2}}{90\%} = \dfrac{99649,23.120}{90\%} = 13259897,33 (kg) = 13259,89(tấn)\)

\(n_{Fe}=\dfrac{5000\cdot10^6}{56}=\dfrac{625}{7}\cdot10^6\left(mol\right)\)

\(BTFe:\)

\(n_{FeS_2}=n_{Fe}=\dfrac{625}{7}\cdot10^6\left(mol\right)\)

\(n_{FeS_2\left(tt\right)}=\dfrac{\dfrac{625}{7}\cdot10^6}{89.6}=\dfrac{56000\cdot10^6}{7}\left(mol\right)\)

\(\Rightarrow m_{FeS_2}=\dfrac{56000\cdot10^6\cdot120}{7}=960000\cdot10^6\left(g\right)=960000\left(tấn\right)\)

\(m_{quặng}=\dfrac{960000\cdot100}{90}=1066666.67\left(tấn\right)\)