Question

You are the medical examiner at the scene of a murder at a restaurant. There is a

suspicion that the victim was poisoned. Their blood contained the following %
composition 80.66%-c, 7.39%-H, 9.39 %-N, and 2.68%-o Which of the following
compounds was the cause of the murder?

Answer 1

The compound : C₄₀H₄₄N₄O

Further explanation

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

• Determine the mass ratio of the constituent elements of the compound.

• Determine the mole ratio by dividing the percentage by the atomic mass

The mol ratio of composition : C : H : N : O

`\tt (80.66)/(12)/ (7.39)/(1)/ (9.39)/(14)/ (2.68)/(16)\\\\6.722/ 7.39/ 0.671/ 0.1675\rightarrow divide~by~smallest(0.1675)\\\\40/ 44/ 4/ 1`