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Chapter 10: Q10.95P (page 409)

Hydrogen cyanide can be catalytically reduced with hydrogen to form methylamine. Use Lewis structures and bond energies to determine Heat of reaction.

Short Answer

Expert verified

The heat of reaction is-717 kJ

Step by step solution

01

Reduction of HCN

02

Heat of reaction

Energyrequiredwhenbondsbroken=1C-H+1(CN)bonds=1413+1891kJ/mol=1304kJ/mol

Energyreleasedwhenbondsformed=3C-H+2N-HBonds=3413+2391kJ=2021kJ

Therefore heat of reaction is=1304-2021kJ/mol=-717kJ

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Most popular questions from this chapter

In the gas phase, phosphorous pentachloride exists as separate molecules. In the solid phase, however, the compound is composed of alternating PCl4+ and PCl6-ions. What change(s) in molecular shape occur(s) as PCl5 solidifies? How does the Cl-P-Cl angle change?

When gaseous sulfur trioxide is dissolved in concentrated sulfuric acid, disulfuric acid forms: SO3+H2SO4→H2SO7

Use bond energies (Table 9.2, p. 353) to determineΔH°rxn.(The S atoms in disulfuric acid are bonded through an O atom. Assume Lewis structures with zero formal charges; BE of S-N-O is 552 kJ/mol.)

In the following compounds, the C atoms form a single ring. Draw a Lewis structure for each compound, identify cases for which resonance exists, and determine the carbon-carbon bond order(s):

  1. C3H4
  2. C3H6
  3. role="math" localid="1658830907333" C4H6
  4. role="math" localid="1658830922547" C4H4
  5. C6H6

Draw Lewis structures of all the important resonance forms of

(a)HNO3HONO2

(b) HAsO42-HOAsO32-

When is a resonance hybrid needed to adequately depict the bonding in a molecule? UsingNO2 as an example, explain how a resonance hybrid is consistent with the actual bond length, bond strength, and bond order.
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