Answer:
The correct answer is 10 atoms of hydrogen
Explanation:
Atomicity of an element is the total number of that element present in the molecule(s) of a compound.
Here, we have 2 molecules of CH₃CH₂O
Thus, each molecule has 5 atoms of hydrogen (3+2), however we have 2 molecules of the compound, hence hydrogen atoms in the two molecules will be 5 × 2 = 10
