Question

balance this equation _zn+_hcl→_zncl₂+_h₂

Explanation:

Step1: Count atoms

Count the number of each atom on both sides of the equation.

• Left side: \(Zn = 1\), \(H = 1\), \(Cl = 1\)
• Right side: \(Zn = 1\), \(H = 2\), \(Cl = 2\)

Step2: Balance Cl atoms

To balance \(Cl\) atoms, put a coefficient of \(2\) in front of \(HCl\).
\(Zn+2HCl
ightarrow ZnCl_2 + H_2\)

Step3: Check other atoms

Now check \(Zn\) and \(H\) atoms.

• \(Zn\): \(1\) on both sides.
• \(H\): \(2\) on both sides.

Answer:

\(1,2,1,1\) (corresponding to the coefficients for \(Zn\), \(HCl\), \(ZnCl_2\), \(H_2\) respectively, which is the option \(1,2,1,1\))