How much heat is absorbed/released when 25.00 g of nh3(g) reacts in the presence of excess o2(g) to produce no(g) and h2o(l) according to the following chemical equation? 4 nh3(g) + 5 o2(g) → 4 no(g) + 6 h2o(l) δh° = 1168 kj

428.7 kJ of heat are absorbed when 25.00 g of NH₃(g) reacts in the presence of excess O₂(g) to produce NO(g) and H₂O(l).

Let's consider the following thermochemical equation.

4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(l)  ΔH° = 1168 kJ

The standard enthalpy of the reaction is positive, which means that the reaction is endothermic, that is, heat is absorbed.

We will convert 25.00 g of NH₃ to moles using its molar mass (17.03 g/mol).

1168 kJ of heat are absorbed when 4 moles of NH₃ react. The heat absorbed when 1.468 moles of NH₃ react is:

428.7 kJ of heat are absorbed when 25.00 g of NH₃(g) reacts in the presence of excess O₂(g) to produce NO(g) and H₂O(l).

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Chemical reactions are defined as the reaction in which two or more reactants combine to form single or more products. The heat can be absorbed or evolved in the reaction. The heat absorbed is 428.7kJ when ammonia reacts with excess oxygen.

Given that,

The chemical equation between ammonia and oxygen is:

Now, the enthalpy of the reaction is positive, such that the reaction is endothermic. In endothermic reaction heat is absorbed.

Now, converting the mass of ammonia into moles, we get:

1168 kJ of heat is absorbed when 4 moles of ammonia react with oxygen. The heat absorbed in 1.468 moles, will be:

Therefore, when 25 grams of ammonia reacts in the presence of oxygen 428.7 kJ will be absorbed. Hence, it is an endothermic reaction.

To know more about heat energy, refer to the following link:

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metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

a electronegativity decreases beacuse the size of nucleus is bigger.