Question

how many valence electrons are in the molecule, c₂h₇n. a) 20 b) 30 c) 24 d) 27 e) 15

Explanation:

Step1: Determine valence - electrons of each atom

Carbon (C) has 4 valence electrons, hydrogen (H) has 1 valence electron, and nitrogen (N) has 5 valence electrons.

Step2: Calculate total valence - electrons

For \(C_2H_7N\), there are 2 C atoms, 7 H atoms, and 1 N atom.
The total number of valence electrons is \(2\times4 + 7\times1+1\times5\).
\[2\times4 + 7\times1+1\times5=8 + 7+5=20\]

Answer:

A. 20