The $0.49 \text{ g}$ mass was used as an example value in the sample calculation provided below the table to demonstrate how to calculate moles of KHP. It is not a mass directly taken from any of the specific trials (Trial 1, 2, or 3) listed in the table above. Here's how the moles were calculated using that example mass: Step 1: Identify the example mass of KHP. The sample calculation uses an example mass of KHP: $$ \text{Mass of KHP} = 0.49 \text{ g} $$ Step 2: Use the molar mass of KHP to calculate moles. The molar mass of potassium hydrogen phthalate (KHP) is $204.24 \text{ g/mol}$. To find the moles, divide the mass by the molar mass: $$ \text{Moles of KHP} = \frac{\text{Mass of KHP}}{\text{Molar mass of KHP}} $$ $$ \text{Moles of KHP} = \frac{0.49 \text{ g}}{204.24 \text{ g/mol}} $$ $$ \text{Moles of KHP} = \boxed{0.0024 \text{ mol}} $$