Textbook Question
Write an equation for the formation of each compound from its elements in their standard states, and find ΔH°rxn for each in Appendix IIB. a. NO2(g)
8. Thermochemistry
Formation Equations
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Which of the following is the balanced equation for the formation reaction of NaNO3(s) from its elements in their standard states?
A
Na(s) + N2(g) + O2(g) → NaNO3(s)
B
Na2O(s) + N2O5(g) → 2 NaNO3(s)
C
Na(s) + 1/2 N2(g) + 3/2 O2(g) → NaNO3(s)
D
Na2O(s) + NO2(g) → 2 NaNO3(s)
Verified step by step guidance1
Understand the concept of a formation reaction: A formation reaction involves creating one mole of a compound from its elements in their standard states.
Identify the elements involved: Sodium (Na), Nitrogen (N2), and Oxygen (O2) are the elements in their standard states.
Write the unbalanced equation: Start with the elements in their standard states forming the compound NaNO3(s). The initial equation is Na(s) + N2(g) + O2(g) → NaNO3(s).
Balance the equation: Ensure that the number of atoms of each element is equal on both sides of the equation. Sodium is already balanced, but nitrogen and oxygen need adjustment. Since NaNO3 contains one nitrogen atom and three oxygen atoms, adjust the coefficients accordingly.
Apply fractional coefficients: To balance nitrogen and oxygen, use fractional coefficients. The balanced equation becomes Na(s) + \(\frac{1}{2}\) N2(g) + \(\frac{3}{2}\) O2(g) → NaNO3(s). This ensures one mole of NaNO3 is formed from its elements in their standard states.
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