a, \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

b, Ta có: \(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)

Theo PT: \(n_{Cu}=n_{CuO}=0,125\left(mol\right)\Rightarrow m_{Cu}=0,125.64=8\left(g\right)\)

c, \(n_{H_2}=n_{CuO}=0,125\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,125.22,4=2,8\left(l\right)\)

a) \(C\%=\dfrac{m_{KCl}}{m_{ddKCl}}.100\%=\dfrac{10}{300}.100\%\approx3,3\%\)

b) Đổi: \(1500ml=1,5l\)

\(C_{MCuSO_4}=\dfrac{n}{V}=\dfrac{3}{1,5}=2M\)

\(a,Không.phản.ứng\\ b,CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ c,Không.phản.ứng\)

a, \(n_{CH_3COOH}=\dfrac{15}{60}=0,25\left(mol\right)\)

PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)

Theo PT: \(n_{CH_3COONa}=n_{CH_3COOH}=0,25\left(mol\right)\)

\(\Rightarrow a=m_{CH_3COONa}=0,25.82=20,5\left(g\right)\)

b, \(m_{dd}=\dfrac{15}{2\%}=750\left(g\right)\)

\(n_{CH_3COOH}=\dfrac{15}{60}=0,25\left(mol\right)\\ NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O\\a, n_{CH_3COONa}=n_{CH_3COOH}=0,25\left(mol\right)\\ a=m_{CH_3COONa}=0,25.82=20,5\left(g\right)\\ b,m_{ddCH_3COOH}=\dfrac{15.100}{2}=750\left(g\right)\)

Kết hợp 2 ý chung luôn em hi!

- Oxit:

+ Oxit axit: SO₂  (Lưu huỳnh đioxit)

+ Oxit bazo: CaO (Canxi oxit)

- Axit:

H₂SO₄ (Axit sunfuric)

- Bazo: 

Ca(OH)₂ (Canxi hidroxit)

- Muối: 

NaCl (Natri clorua)

\(n_{H_2SO_4}=\dfrac{196.20\%}{98}=0,4\left(mol\right)\\ a,m_{H_2SO_4}=0,4.98=39,2\left(g\right)\\ b,m_{H_2O}=196-39,2=156,8\left(g\right)\)

\(n_{HCl}=\dfrac{7,3\%.200}{36,5}=0,4\left(mol\right)\\ a,Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{Zn}=n_{H_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ m=m_{Zn}=0,2.65=13\left(g\right)\\ c,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)

\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right);n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\\ a,Fe+2HCl\rightarrow FeCl_2+H_2\\ b,Vì:\dfrac{0,15}{1}>\dfrac{0,2}{2}\Rightarrow Fe.dư\\ n_{Fe\left(dư\right)}=0,15-\dfrac{0,2}{2}=0,05\left(mol\right)\\ m_{Fe\left(dư\right)}=0,05.56=2,8\left(g\right)\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ n_{H_2}=n_{Zn}=0,1\left(mol\right);n_{HCl}=2.0,1=0,2\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ b,V_{ddHCl}=\dfrac{0,2}{0,5}=0,4\left(lít\right)\)

Đề sai:

Sửa lại:

Cho 2,7 gam aluminium tác dụng với acid sunfuric acid a a.Viết PTHH b.Tính khối lượng muối tạo thành c.Nếu dùng thể tích khí hydrogen sinh ra để khử 23,2 gam Fe₃O₄ tính khối lượng kim loại thu được

a, \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

b, \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)

Theo PT: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,05\left(mol\right)\)

\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)

c, Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,15\left(mol\right)\)

Ta có: \(n_{Fe_3O_4}=\dfrac{23,2}{232}=0,1\left(mol\right)\)

PT: \(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)

Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,15}{4}\), ta được Fe₃O₄ dư.

Theo PT: \(n_{Fe}=\dfrac{3}{4}n_{H_2}=0,1125\left(mol\right)\Rightarrow m_{Fe}=0,1125.56=6,3\left(g\right)\)