a)PT: Fe + S \(\underrightarrow{t}\)FeS
b) n\(_{Fe}\)=\(\dfrac{4,48}{56}\)=0.08(mol)
n\(_S\)=\(\dfrac{3,2}{32}\)=0,1(mol)
Ta có: \(\dfrac{n_{Fe}}{1}\):\(\dfrac{n_S}{1}\)\(\Rightarrow\)\(\dfrac{0.08}{1}\) < \(\dfrac{0,1}{1}\)\(\Rightarrow\)n\(_S\) PƯ dư
n\(_S\)(pư)=n\(_{Fe}\)=0,08(mol)\(\Rightarrow\)n\(_S\)(dư)=n\(_S\)-n\(_S\)(pư)=0,1-0,08=0,02(mol)
\(\Rightarrow\)m\(_S\)(dư)= 0,02.32=0,64(g)
c)Thep PT(a) ta có:n\(_{FeS}\)=n\(_{Fe}\)=0,08(mol)\(\Rightarrow\)m\(_{FeS}\)=0,08. 72=5,76(g)
\(n_{Fe}=\dfrac{4,48}{56}=0,08\left(mol\right)\)
\(n_S=\dfrac{3,2}{32}=0,1\left(mol\right)\)
a) PT: Fe + S → FeS
Trước 0,08 0,1 0 mol
Trong 0,08 0,08 0,08 mol
Sau 0 0,02 0,08 mol
b) Fe còn dư
mFe dư = 0,02.56 = 1,12 (g)
c) mFeS = 0,08.88 = 7,04 (g)