1.0 gramme
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depends what it is a ml of? ml of water is not as dense as ml of mercury for example
A milliliter of water, by definition, weighs one milligram. That is its mass. When 150 mL of water freezes, the volume of the water will change, but the mass will remain the same. So 150 mL of water will weight 150 mg, no matter what state of matter it's in.
Water has a density of about 1 (or 1000, depending on the units used...) meaning that every ml of water has a mass very close to 1 gram.
For fresh water at room temperature, it is 25 grams
The one which has a density of 2.5 g/ml (making its volume 8 ml).