Question

Use the figure below to answer the question that follows.
Which of the four molecules has the highest percentage of nitrogen, by mass?

• A. I
• B. II
• C. III
• D. IV

Answer 1

The correct option is B II

If the other atoms of molecules have comparitively less atomic mass then percentage of central atom is more.

In $II\Rightarrow N_2{H}_4$ has Hydrogen atoms which has very less atomic mass (1) compared to Nitrogen (14). So, $N_2{H}_4$ has highest percentage of Nitrogen.