2018 · Q5
The compound C₇H₇NO₂ has
General KnowledgeChemistry
- A17 atoms in a molecule of the compound
- Bequal molecules of C and H by mass
- Ctwice the mass of oxygen atoms compared to nitrogen atoms
- Dtwice the mass of nitrogen atoms compared to hydrogen atoms
Explanation
The molecular formula C7H7NO2 contains 7 carbon atoms, 7 hydrogen atoms, 1 nitrogen atom and 2 oxygen atoms. Adding them gives 7 + 7 + 1 + 2 = 17 atoms in one molecule of the compound. The other options concern mass ratios, which are not asked for here. Hence the molecule has 17 atoms.