How Do You Calculate the Mass of an Osmium Sphere?

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To calculate the mass of an osmium sphere with a diameter of 15 cm, first determine the radius, which is 7.5 cm. Use the formula for the volume of a sphere, V = 4/3 * π * (radius)^3, to find the volume. With the density of osmium at 22.57 g/cm^3, apply the formula for density, which is mass = density * volume, to calculate the mass. The final mass will be in grams, so convert it to kilograms by dividing by 1000. Understanding these formulas is crucial for solving similar problems in the future.
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I am having trouble with how to set up the equation for this problem...

Os is the densest element known. Given that the density of Os is 22.57g/cm^3, calculate the mass, in kg, of an Os sphere 15 cm in diameter, which is about the size of a grapefruit.

Any help would be greatly appreciated. I am really confused with where the diameter fits in... I feel so lost in this class! Yikes!
 
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You need to work on the basics:
Volume of a sphere = 4/3( pi ) (radius cubed)
Density = mass/volume
 

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