The formula to calculate the volume of a sphere is V = (4/3) * pi * r^3, where r is the radius of the sphere.
Given that the radius of the chocolate truffle is 12 mm, we can substitute it into the formula:
V = (4/3) * 3.14 * 12^3
V = (4/3) * 3.14 * 1728
V = 7234.56 mm^3
Therefore, the volume of chocolate in the chocolate truffle is approximately 7234.56 mm^3.