What is the mass of an object with a density of 15 g/mL and a volume of 3 mL?

The correct option is 45 g.

Step 1: Identify the given values

From the problem statement, we are given the following values:

Density ($d$) = 15 g/mL

Volume ($V$) = 3 mL

Step 2: Recall the formula for density

The relationship between density, mass, and volume is given by the formula:

$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$

Step 3: Rearrange the formula to solve for mass

To find the mass ($m$), multiply both sides of the equation by volume ($V$):

$\text{Mass}=\text{Density}\times \text{Volume}$

Step 4: Substitute the given values and calculate

$\text{Mass}=15\text{g/mL}\times 3\text{mL}$

$\text{Mass}=45\text{g}$

Therefore, the mass of the object is 45 g.