what is the missing coefficient to make a balanced equation? 2na + cl₂ → ?nacl 2 7 1 4

Explanation:

Step1: Count sodium atoms

There are 2 sodium (Na) atoms on the left - hand side of the equation ($2Na$).

Step2: Balance sodium atoms

To balance the number of sodium atoms on both sides, the coefficient in front of $NaCl$ must be 2 so that there are also 2 sodium atoms on the right - hand side.

Step3: Check chlorine atoms

On the left - hand side, there are 2 chlorine (Cl) atoms in $Cl_2$. In $2NaCl$, there are also 2 chlorine atoms. The equation is balanced.

Answer:

2