Increasing order of priority of the given groups has to be given. Given groups are − C H 3 , − H , − B r , − C H 2 C H 3 Concept Introduction: The group attached to asymmetric center should be ranked based on the atomic number of atom which directly connected to asymmetric center. The higher the atomic number of atom, higher the priority. If there is tie, then consider the next atoms attached to the connected atom and so on.

Question

Calculate the enthalpy of formation of propane from:a. Combustion data (ΔHc = –2217 kJ mol–1; ΔHf (CO2) = –393.4 kJ mol–1, ΔHf (H2O) =–285.2 kJ mol–1);b. Bond enthalpies (C–C 348 kJ mol–1; C–H 413 kJ mol–1; H–H 436 kJ mol–1; ΔHvap forcarbon = –717 kJ mol–1).

Answer 1

Question

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Chapter 5, Problem 5.15P

(a)

Interpretation Introduction

Interpretation:

Increasing order of priority of the given groups has to be given. Given groups are −CH3, −H, −Br, −CH2CH3

Concept Introduction:

The group attached to asymmetric center should be ranked based on the atomic number of atom which directly connected to asymmetric center. The higher the atomic number of atom, higher the priority. If there is tie, then consider the next atoms attached to the connected atom and so on.

(b)

Interpretation Introduction

Interpretation:

Increasing order of priority of the given groups has to be given. Given groups are −OCH3,−CH(CH3)2,−B(CH2CH3), −H

Concept Introduction:

The group attached to asymmetric center should be ranked based on the atomic number of atom which directly connected to asymmetric center. The higher the atomic number of atom, higher the priority. If there is tie, then consider the next atoms attached to the connected atom and so on.

(b)

Interpretation Introduction

Interpretation:

Increasing order of priority of the given groups has to be given. Given groups are −CH3,−CH2OH,−CH2NH2, −CH2Br

Concept Introduction:

The group attached to asymmetric center should be ranked based on the atomic number of atom which directly connected to asymmetric center. The higher the atomic number of atom, higher the priority. If there is tie, then consider the next atoms attached to the connected atom and so on.

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