Question

Enter the chemical equation for the formation of Pb(NO₃)₂(s) from its respective elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer.

What is the value of ΔH∘f for this reaction?

Answer 1

The balanced chemical equation for the formation of Pb(NO₃)₂ from its elements is Pb(s) + 2NO₂(g) + ½O₂(g) → Pb(NO₃)₂(s). The ΔH°f value is an experimental value found in tables of standard enthalpies of formation.

Step-by-step explanation:

To answer your question, let's write the balanced chemical equation for the formation of Pb(NO₃)₂ from its elements in their standard states:

Pb(s) + 2NO₂(g) + ½O₂(g) → Pb(NO₃)₂(s)

In this equation, 's' stands for solid, 'g' for gas, and the reaction shows lead (solid), nitrogen dioxide (gas), and oxygen (gas) combining to form solid lead (II) nitrate. To balance this equation, one mole of lead reacts with two moles of nitrogen dioxide and half a mole of oxygen to produce one mole of lead nitrate.

Now, regarding the ΔH°f, or standard enthalpy of formation, this value would typically be found in a table of standard enthalpies of formation as it is an experimental value. This value represents the heat change that occurs when one mole of a substance is formed from its elements in their standard states at 1 atm and 25°C (298 K).