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\(1.\\ n_A=\dfrac{16,8}{A}mol\\ n_{H_2}=\dfrac{7,437}{24,79}=0,3mol\\ A+2HCl\rightarrow ACl_2+H_2\\ \Rightarrow\dfrac{16,8}{A}=0,3\\ \Rightarrow A=56g/mol\\ \Rightarrow A.là.Fe\\ \Rightarrow Chọn.A\\ 2.\\ n_{Fe}=\dfrac{5,6}{56}=0,1mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=0,1mol\\ V_{H_2}=0,1.24,79=2,479l\\ \Rightarrow Chọn.B\\ 3.\\ Axit:H_2SO_4;HCl\\ \Rightarrow Chọn.B\\ 4.\\ 3,719l\Rightarrow3,7185\\ CTHH:R\\ n_R=\dfrac{3,6}{R}mol\\ n_{H_2}=\dfrac{3,7185}{24,79}=0,15mol\\ R+2HCl\rightarrow RCl_2+H_2\\ \Rightarrow\dfrac{3,6}{R}=0,15\\ \Rightarrow R=24g/mol,Mg\\ \Rightarrow Chọn.B\)
a) \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,15-->0,3------>0,15-->0,15
=> mHCl = 0,3.36,5 = 10,95 (g)
b)
mZnCl2 = 0,15.136 = 20,4 (g)
c)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,05<---0,15------->0,1
=> mFe2O3 = 0,05.160 = 8 (g)
mFe = 0,1.56 = 5,6 (g)
a.b.\(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{9,75}{65}=0,15mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,15 0,3 0,15 0,15 ( mol )
\(m_{HCl}=n_{HCl}.M_{HCl}=0,3.36,5=10,95g\)
\(m_{ZnCl_2}=n_{ZnCl_2}.M_{ZnCl_2}=0,15.136-20,4g\)
c.\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,05 0,15 0,1 ( mol )
\(m_{Fe_2O_3}=n_{Fe_2O_3}.M_{Fe_2O_3}=0,05.160=8g\)
\(m_{Fe}=n_{Fe}.M_{Fe}=0,1.56=5,6g\)
\(a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ b,n_{FeCl_2}=n_{H_2}=n_{Fe}=0,4\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ c,m_{FeCl_2}=127.0,4=50,8\left(g\right)\)
\(a,ĐLBTKL.có.trong.sgk.rồi.tự.học\)
\(b,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Áp.dụng.ĐLBTKL,ta.có:\\ m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ m_{H_2}=m_{Zn}+m_{HCl}-m_{ZnCl_2}=6,5+7,3-13,6=0,2\left(g\right)\\ n_{H_2}=\dfrac{m}{M}=\dfrac{0,2}{2}=0,1\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,1.22,4=2,24\left(l\right)\)
Câu 1:
a, Zinc + Hydrochloric acid → Zinc chloride + Hydrogen
b, Theo ĐLBT KL, có: mZn + mHCl = mZnCl2 + mH2
⇒ mHCl = 40,8 + 0,6 - 19,5 = 21,9 (g)
Bài 2:
a, Dấu hiệu: Có chất mới xuất hiện (ZnCl2 và H2)
b, PT: Iron + Hydrochloric acid → Iron (II) chloride + hydrogen
c, Theo ĐLBT KL: mFe + mHCl = mFeCl2 + mH2
⇒ mH2 = 5,6 + 7,3 - 12,7 = 0,2 (g)
Bài 3:
a, PT: Magnesium + Oxygen → Magnesium oxide
b, mMg + mO2 = mMgO
c, Từ phần b, có: mO2 = 15 - 9 = 6 (g)
Bạn tham khảo nhé!
\(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\\ a,PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ b,n_{MgCl_2}=n_{H_2}=n_{Mg}=0,4\left(mol\right)\\ m_{MgCl_2}=95.0,4=38\left(g\right)\\ b,V_{H_2\left(đkc\right)}=0,4.24,79=9,916\left(l\right)\\ d,n_{HCl}=0,4.2=0,8\left(mol\right)\\ V_{ddHCl}=\dfrac{0,8}{2}=0,4\left(l\right)\)
cho tui hỏi sao thể tích cần dùng lại tính thêm thể tích hcl vậy ạ
\(a)K_2O+2HCl\rightarrow2KCl+H_2O\\ CaO+2HCl\rightarrow CaCl_2+H_2O\\ Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\\ KOH+HCl\rightarrow KCl+H_2O\\ Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\\Al\left(OH\right)_3+3HCl\rightarrow AlCl_3+3H_2O\\ b)K_2O+H_2SO_4\rightarrow K_2SO_4+H_2O\\ CaO+H_2SO_4\rightarrow CaSO_4+H_2O\\ Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\\ 2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\\ Ca\left(OH\right)_2+H_2SO_4\rightarrow CaSO_4+2H_2O\\2 Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)
\(c)3K_2O+2H_3PO_4\rightarrow2K_3PO_4+3H_2O\\ 3CaO+2H_3PO_4\rightarrow Ca_3\left(PO_4\right)_2+3H_2O\\Al_2O_3+2H_3PO_4\rightarrow2AlPO_4+3H_2O\\ 2KOH+H_3PO_4\rightarrow K_3PO_4+2H_2O\\ 3Ca\left(OH\right)_2+2H_3PO_4\rightarrow Ca_3\left(PO_4\right)_2+6H_2O\\ Al\left(OH\right)_3+H_3PO_4\rightarrow AlPO_4+3H_2O\)
\(n_{HCl}=0,5.0,2=0,1\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05<--0,1----->0,05--->0,05
\(m_{Fe}=0,05.56=2,8\left(g\right)\)
\(m_{FeCl2}=0,05.127=6,35\left(g\right)\)
\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)
\(V_{H2\left(dkc\right)}=0,05.24,79=1,2395\left(l\right)\)