Final answer:
The density of the substance is calculated using the formula density = mass/volume, which in this case results in a density of 6.67 g/mL.
Step-by-step explanation:
To calculate the density of a substance, you use the formula density = mass/volume. In this case, the mass of the substance is given as 100g and the volume is 15mL.
The calculation would be as follows:
Density = 100g / 15mL
Calculation:
Density = 6.67 g/mL
Therefore, the correct answer is a. 6.67 g/mL.