Question

An oxide of nitrogen has a molecular weight $92$. Find the total number of electrons in one gram mole of that oxide. ($N$ is Avogadro number)

• A. $4.6N$
• B. $46N$
• C. $23N$
• D. $2.3N$

Answer 1

The correct option is B $46N$

The atomic numbers of nitrogen and oxygen are one half their mass numbers. Hence, one molecule of compound having molecular weight of $92$ will contain $46$ electrons. So, $1$ gram mole of molecule will contain $46N$ electrons. Here, $N$ is the Avogadro number.