Question

#4
naf + br₂ → nabr + f₂
na:
f:
br:
#3
bas + li₃n → ba₃n₂ + li₂s
ba:
s:
li:
n:

Explanation:

Step1: Balance equation #3

$$\mathrm{3BaS + 2Li_3N ightarrow Ba_3N_2 + 3Li_2S}$$

Step2: Balance equation #4

$$\mathrm{2NaF + Br_2 ightarrow 2NaBr + F_2}$$

Answer:

$$\mathrm{3BaS + 2Li_3N ightarrow Ba_3N_2 + 3Li_2S}$$

$$\mathrm{2NaF + Br_2 ightarrow 2NaBr + F_2}$$