Question

what is the missing coefficient to make a balanced equation? ? na + cl₂ → nacl. be sure the equation is balanced before entering the coefficients. 7 2 1 4

Explanation:

Step1: Balance chlorine atoms

There are 2 chlorine atoms in $Cl_2$. So, we need 2 moles of $NaCl$ to balance the chlorine atoms on the right - hand side.

Step2: Balance sodium atoms

Since we have 2 moles of $NaCl$, we need 2 moles of $Na$ on the left - hand side to balance the sodium atoms. The balanced equation is $2Na + Cl_2
ightarrow2NaCl$.

Answer:

2