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Chapter 13: Q 1. (page 499)

Question: What is the mass of the molecular ion formed from compounds having each molecular formula:

(a) C3H6O; (b)C10H20;(c)C8H8O2; (d) methamphetamine (C10H15N)?

Short Answer

Expert verified

Answer

a. 58

b. 140

c. 136

d. 149

Step by step solution

01

Molecular ion

A molecular ion is formed by the bombardment of the given molecule with electron beams. It is a cation with a single unit positive charge and a radical with an unpaired electron.

02

Mass of molecular ions

Since the mass of the departing electron is almost negligible concerning the mass of the molecule, the mass of the molecular ion thus formed remains the same as the original molecule.

03

Determination of the mass

a. The mass of is the total mass of its substituents.

C3H6翱鈥�=鈥�3脳12鈥�+鈥�6脳1鈥�+鈥�1脳16=鈥�36鈥�+鈥�6鈥�+鈥�16=鈥�58

Hence, the mass of the molecular ion of C3H6O is 58.


b. The mass of is the total mass of its substituents.

C10H20鈥�=鈥�10脳12鈥�+鈥�20脳1鈥�=鈥�120鈥�+鈥�20鈥�=鈥�140

Hence, the mass of the molecular ion of C10H20is 140.

c. The mass of is the total mass of its substituents.

C8H8O2鈥�=鈥�8脳12鈥�+鈥�8脳1鈥�+鈥�2脳16=鈥�96鈥�+鈥�8鈥�+鈥�32=鈥�136

Hence, the mass of the molecular ion of C8H8O2 is 136.

d. The mass of is the total mass of its substituents.

C10H15狈鈥�=鈥�10脳12鈥�+鈥�15脳1鈥�+鈥�1脳14=鈥�120鈥�+鈥�15鈥�+鈥�14=鈥�149

Hence, the mass of the molecular ion of C10H15N is 149.

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Most popular questions from this chapter

Question: Propose structures consistent with each set of data: (a) a hydrocarbon with a molecular ion at m/z = 68 and IR absorptions at 3310, 3000鈥�2850, and 2120 cm鈭�1;

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