Question

question 19 (1 point)
use the following information to answer the next question.
the equilibrium constant has been determined in
several reactions as follows:

1. n₂(g) + o₂(g) ↔ 2no(g) k_eq = 4.8 x 10⁻³¹
2. h₂(g) + cl₂(g) ↔ 2hcl (g) k_eq = 4.0 x 10³¹
3. 2co(g) + o₂(g) ↔ 2co₂(g) k_eq = 2.3 x 10²²
4. cu(s) + 2ag⁺(aq) ↔ cu²⁺(aq) + 2ag(s) k_eq = 2.0 x 10¹⁵

the correct arrangement of the above reactions, in decreasing order of their ability to form products, is _____, ___, ___, and _____.
○ 1, 2, 4, 3
○ 1, 4, 3, 2
○ 2, 1, 3, 4
○ 2, 3, 4, 1
○ 3, 4, 2, 1
question 20 (1 point)
phosphoric acid is found in fertilizers. the equilibrium reaction used to produce phosphoric acid from water and tetraphosphorus decaoxide is shown below.
p₄o₁₀(s) + h₂o(l) ↔ h₃po₄(aq) + heat
this equilibrium reaction _______.
○ is endothermic and homogeneous
○ is exothermic and homogeneous
○ is endothermic and heterogeneous
○ is exothermic and heterogeneous
○ cannot be determined

Explanation:

Question 19

Step1: Understand the relationship between \(K_{eq}\) and product formation

The larger the equilibrium constant (\(K_{eq}\)), the more the reaction favors the formation of products.

Step2: Compare the \(K_{eq}\) values

• For reaction 2: \(K_{eq}=4.0\times 10^{31}\)
• For reaction 3: \(K_{eq}=2.3\times 10^{22}\)
• For reaction 4: \(K_{eq}=2.0\times 10^{15}\)
• For reaction 1: \(K_{eq}=4.8\times 10^{-31}\)

Question 20

Step1: Determine the type of reaction (endothermic or exothermic)

Since heat is a product (\(P_4O_{10(s)}+H_2O_{(l)}
ightleftharpoons H_3PO_{4(aq)}+\text{heat}\)), the reaction is exothermic (releases heat).

Step2: Determine if the reaction is homogeneous or heterogeneous

A homogeneous reaction has all species in the same phase. A heterogeneous reaction has species in different phases. Here, \(P_4O_{10}\) is solid (\(s\)), \(H_2O\) is liquid (\(l\)), and \(H_3PO_4\) is aqueous (\(aq\)). So, it is heterogeneous.

Answer:

• Question 19: 2, 3, 4, 1
• Question 20: is exothermic and heterogeneous