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The active ingredient in aspirin is acetylsalicylic acid. In a lab class, a student uses paper chromatography to isolate another common ingredient of headache remedies. The sample of this ingredient had a mass of 384 mg and a volume of 0.32 cm3. Looking at the following data, what was the other ingredient in the headache remedy? White table sugar Caffeine Sodium Chloride D -0.70 g/mL D 1.2 g/mL D 2.2 g/mL

Answer :

Answer: Caffeine

Explanation:

Density is defined as the ratio of mass of object to its volume. The mathematical expression of density is given as:

[tex]\text{Density of substance}=\frac{\text{Mass of a substance}}{\text{Volume of a substance}}[/tex]

We are given:

Mass of ingredient= 384 mg =[tex]\frac{384}{1000}=0.384g[/tex]  (1g=1000mg)

Volume of ingredient= [tex]0.32cm^3=0.32mL=[/tex]     (Conversion factor: [tex]1cm^3=1mL[/tex]  )

Putting values in above equation, we get:

[tex]Density =\frac{0.384g}{0.32ml}=1.2g/ml[/tex]

Hence, the density of ingredient is 1.2 g/ml and it is caffeine.

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