a,\(n_{H_2SO_4}=0,2.3=0,6\left(mol\right);n_{BaCl_2}=0,35.2=0,7\left(mol\right)\)
PTHH: H2SO4 + BaCl2 → BaSO4 ↓ + 2HCl
Mol: 0,6 0,6 0,6 0,12
Ta có: \(\dfrac{0,6}{1}< \dfrac{0,7}{1}\)⇒ H2SO4 hết, BaCl2 dư
\(m_{BaSO_4}=0,6.233=139,8\left(g\right)\)
b,Vdd sau pứ = 0,2+0,35 = 0,55 (l)
\(C_{M_{HCl}}=\dfrac{0,6}{0,55}=\dfrac{12}{11}M\)
\(C_{M_{BaCl_2dư}}=\dfrac{0,7-0,6}{0,55}=\dfrac{2}{11}M\)
c,\(m_{H_2SO_4\left(lt\right)}=0,6.98=58,8\left(g\right)\Rightarrow m_{H_2SO_4\left(pứ\right)}=\dfrac{58,8}{75\%}=78,4\left(g\right)\)
\(n_{H_2SO_4}=\dfrac{78,4}{98}=0,8\left(mol\right)\)
PTHH: 3FeS2 + 6H2O + 11O2 → Fe3O4 + 6H2SO4
Mol: 0,4 0,8
\(m_{FeS_2\left(lt\right)}=0,8.120=96\left(g\right)\)
