We have to calculate the empirical formula of nicotine using the given percentages of elements.

**The given percentages are:** C 74.03%, H 8.70%, N 17.27%

**Empirical formula** is a chemical formula that gives the **relative proportions of elements** in a compound but **not the actual number of atoms** of elements in a compound.

**Empirical formula of a compound can be calculated using these steps:**

**Step 1:** Find the masses of elements in the compound.

**Step 2:** Find the percentages elements in the compound.

**Step 3:** Dividing the percentages of elements by their average atomic masses.

**Step 4:** Dividing the obtained numbers by the smallest number among them and rounding off to the nearest whole numbers to get the empirical formula.

Calculate the empirical formula for each of the following stimulants based on their elemental mass percent composition.

nicotine (found in tobacco leaves): C 74.03%, H 8.70%, N 17.27%