Question

1. \\(2\text{hcl} + 2\text{na} \longrightarrow \underline{\quad} \text{nacl} + \text{h}_2\\)

in this chemical equation, if the coefficient in front of
a\ were changed to 4, what coefficient in front of
acl\ would be needed to balance this equation
enter the correct number in the box.

Explanation:

Step1: Understand the law of conservation of mass

In a chemical equation, the number of atoms of each element must be the same on both sides (reactants and products) due to the law of conservation of mass.

Step2: Analyze the sodium (Na) atoms

The coefficient of Na is changed to 4. In the product NaCl, each NaCl contains 1 Na atom. To balance the Na atoms, the number of NaCl molecules should be equal to the number of Na atoms on the reactant side.

Step3: Determine the coefficient of NaCl

Since there are 4 Na atoms (from 4 Na), and each NaCl has 1 Na, the coefficient of NaCl must be 4 to balance the Na atoms. Also, we can check Cl: on the reactant side, if we consider HCl, but here the key for Na - NaCl balance is direct. Since Na (4 atoms) will form NaCl, each Na gives one NaCl, so 4 NaCl.

Answer:

4