Question

1. type the correct numbers in the blanks below. type in 1 if the coefficient is 1. balance the following synthesis reaction. _ n₂ + _ h₂ → ___ nh₃ 5) choose the best answer. which of the following reactions shown that heat has been added? \\(\ce{fe + s ->\delta fes}\\) \\(\ce{c + o₂ -> co₂}\\) \\(\ce{2na + cl₂ -> 2nacl + energy}\\) \\(\ce{h₂o ->通电 h₂ + o₂}\\)

Explanation:

Step1: Balance nitrogen atoms

Count N on each side: 2 on left, 1 on right. Multiply $\text{NH}_3$ by 2:
$\text{N}_2 + \text{H}_2
ightarrow 2\text{NH}_3$

Step2: Balance hydrogen atoms

Count H on each side: 2 on left, 6 on right. Multiply $\text{H}_2$ by 3:
$\text{N}_2 + 3\text{H}_2
ightarrow 2\text{NH}_3$

Step3: Identify heat-added reaction

Look for $\Delta$ (heat symbol) above arrow, indicating added heat.

Answer:

Balanced reaction coefficients: 1, 3, 2
Correct reaction for added heat: $\text{Fe} + 2\text{S} \stackrel{\Delta}{
ightarrow} \text{FeS}_2$