Question

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

Explanation:

Step1: Balance chlorine atoms

On the left - hand side, we have $Cl_2$ which has 2 chlorine atoms. On the right - hand side, in $NaCl$ there is 1 chlorine atom per formula unit. So, to balance the chlorine atoms, the coefficient of $NaCl$ must be 2: $Na+Cl_2
ightarrow2NaCl$.

Step2: Balance sodium atoms

Now, on the right - hand side, we have 2 sodium atoms in $2NaCl$. So, the coefficient of $Na$ on the left - hand side must be 2. The balanced equation is $2Na + Cl_2
ightarrow2NaCl$.

Answer:

2