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To find the mass of the marble block, you need to calculate the volume first and then use the density.

1. Calculate the volume:

   • Volume = length × width × height
   • Volume = 25 cm × 12 cm × 6.5 cm
   • Volume = 1950 cm³

2. Calculate the mass:

   • Density of marble = 2.5 g/cm³
   • Mass = volume × density
   • Mass = 1950 cm³ × 2.5 g/cm³
   • Mass = 4875 g

Convert the mass to kilograms:

• Mass = 4875 g = 4.875 kg

The mass of the marble block is 4.875 kg.