A rock with a volume of 4.0cm³ and density of 3.0g/cm³ has a mass of

12g

Explanation:

Given parameters:

Volume of rock  = 4.0cm³

Density of rock = 3.0g/cm³

Unknown:

Mass of the rock  = ?

Solution:

Density is the mass per unit volume of a substance.

Mathematically, it is expressed as;

   Density  =  

       Mass  = density x volume

Now, insert the parameters and solve;

       Mass  = 3.0g/cm³ x 4.0cm³  = 12g

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explanation:

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the answer is na (sodium)