Question

Al2O3+?=Alcl3+? ?+H2CO3=CaCO3+H2O CuCl+?=Cu(OH)2+?

Answer 1

Al2O3+ 6HCl = 2AlCl3+ 3H2O
CaO + H2CO3 = CaCO3 ↓+H2O
CuCl+ 2NaOH = Cu(OH)2↓ + 2NaCl

Answer 2

Let's balance the chemical equations you provided:

1. Al2O3 + ? = AlCl3 + ?

To balance this equation, we need to ensure that the number of each type of atom is the same on both sides of the equation.

For the left side, we have 2 aluminum (Al) atoms and 3 oxygen (O) atoms. For the right side, we have 1 aluminum (Al) atom and 3 chlorine (Cl) atoms.

To balance the equation, you can use the following coefficients:

Al2O3 + 6HCl = 2AlCl3 + 3H2O

This equation is balanced.

2. ? + H2CO3 = CaCO3 + H2O

To balance this equation, we need to ensure that the number of each type of atom is the same on both sides of the equation.

For the left side, we have 1 carbon (C) atom, 2 hydrogen (H) atoms, 3 oxygen (O) atoms, and 1 calcium (Ca) atom. For the right side, we have 1 carbon (C) atom, 2 hydrogen (H) atoms, 4 oxygen (O) atoms, and 1 calcium (Ca) atom.

To balance the equation, you can use the following coefficients:

Ca(OH)2 + 2H2CO3 = CaCO3 + 3H2O

This equation is balanced.

3. CuCl + ? = Cu(OH)2 + ?

To balance this equation, we need to ensure that the number of each type of atom is the same on both sides of the equation.

For the left side, we have 1 copper (Cu) atom and 1 chlorine (Cl) atom. For the right side, we have 1 copper (Cu) atom, 2 oxygen (O) atoms, and 2 hydrogen (H) atoms.

To balance the equation, you can use the following coefficients:

CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl

This equation is balanced.

Please note that there may be multiple valid ways to balance chemical equations, but the coefficients I provided will ensure that the number of each type of atom is the same on both sides of the equation.