a) Mg + 2HCl --> MgCl₂ + H₂

b) Theo ĐLBTKL: m_Mg + m_HCl = m_MgCl2 + m_H2 (1)

c) 

\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)=>m_{H_2}=0,5.2=1\left(g\right)\)

(1) => m_MgCl2 = 12+36,5-1 = 47,5(g)

a: \(Mg+2HCl->MgCl_2+H_2\)

b: \(n_H=\dfrac{11.2}{22.4}=0.5\)

\(\Leftrightarrow m_H=M_H\cdot n_H=0.5\cdot2=1\left(g\right)\)

\(a.Mg+2HCl\rightarrow MgCl_2+H_2\\ b.m_{H_2}=\dfrac{11,2}{22,4}.2=1\left(g\right)\\ c.BTKL:m_{Mg}+m_{HCl}=m_{MgCl_2}+m_{H_2}\\ \Rightarrow m_{MgCl_2}=12+36,5-1=47,5\left(g\right)\)

a) Mg + 2HCl --> MgCl₂ + H₂

b) Theo ĐLBTKL: m_Mg + m_HCl = m_MgCl2 + m_H2 (1)

c) \(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

=> \(m_{H_2}=2.0,5=1\left(g\right)\)

Theo ĐLBTKL => m_MgCl2 =m_Mg + m_HCl - m_H2

= 12+36,5-1 = 47,5(g)

a) Zn + 2HCl --> ZnCl₂ + H₂

b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

_____0,15<-------------------0,15

=> m_Zn = 0,15.65 = 9,75(g)

c) \(n_{HCl}=\dfrac{3,65}{36,5}=0,1\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

__________0,1------------->0,05

=> V_H2 = 0,05.22,4 = 1,12(l)

\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right);n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\a, Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,V\text{ì}:\dfrac{0,2}{1}>\dfrac{0,1}{1}\Rightarrow Zn\text{dư}\\ \Rightarrow n_{Zn\left(p.\text{ứ}\right)}=n_{ZnCl_2}=n_{H_2}=0,1\left(mol\right)\\b, m_{Zn\left(p.\text{ứ}\right)}=0,1.65=6,5\left(g\right)\\ n_{HCl}=0,1.2=0,2\left(mol\right)\\ m_{HCl}=0,2.36,5=7,3\left(g\right)\\ d,m_{ZnCl_2}=136.0,1=13,6\left(g\right)\)

a. \(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)

PTHH : Zn + 2HCl -> ZnCl₂ + H₂

            0,1      0,2                  0,1

b. \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)

c. \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)

\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

0,1      0,2                       0,1

\(V_{H_2}=0,1\cdot22,4=2,24l\)

\(m_{HCl}=0,2\cdot36,5=7,3g\)

a) 

Zn  +  2HCl  →  ZnCl₂   +  H₂ 

b) nZn = \(\dfrac{3,5}{65}\)=\(\dfrac{7}{130}\) mol 

Theo tỉ lệ phản ứng => nH₂ = nZn= \(\dfrac{7}{130}\)mol

<=> V H₂ = \(\dfrac{7}{130}\).22,4 = 1,206 lít

c) nZnCl₂ = nZn => mZnCl₂ = \(\dfrac{7}{130}\).136= 7,32 gam

a) Phương trình chữ: Kẽm + Axit Clohidric \(--->\) Kẽm Clorua + Hidro

    PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

b) Tỉ lệ 1 : 2 : 1 : 1

c) Bảo toàn khối lượng: \(m_{HCl}=m_{ZnCl_2}+m_{H_2}-m_{Zn}=3,9\left(g\right)\)

a) Zn + 2HCl --> ZnCl₂ + H₂

b) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

           0,2--------------------->0,2

=> V_H2 = 0,2.22,4 = 4,48 (l)

c) \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)

PTHH: CuO + H₂ --t^o--> Cu + H₂O

Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\) => CuO dư, H₂ hết

PTHH: CuO + H₂ --t^o--> Cu + H₂O

             0,2<--0,2-------->0,2

=> n_CuO(dư) = 0,3 - 0,2 = 0,1 (mol)

m_Cu = 0,2.64 = 12,8 (g)