The answer depends on the temperature and pressure.
At the pressure of 1 atmosphere, at 4 deg C the volume is at its minimum volume of 5.00014 millilitres.
At 20 deg C it is 5.00898 ml
At 100 deg C the volume increases to 5.21703 ml.
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The density of pure water at +4 degrees C, is 1 g/ml. The volume, then, of 5000 kg of water is 5000 liters.
Foam.
Assuming the gold nugget is solid and pure (unlikely in real life!) The volume of the nugget is 77.0 - 50.0 mL = 27.0 mL So density = mass/volume = 521/27.0 = 19.3 g per mL.
Just divide the mass by the volume.
50/2.6 = 19.231 gm/cm3 (rounded)