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.
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For fresh water at room temperature, it is 25 grams
1 ml = 1g of water so 25ml would weight 25 grams
The one which has a density of 2.5 g/ml (making its volume 8 ml).
The answer depends on the temperature, but at room temperature (20 deg C), 100 ml of water would have a mass of 99.82 grams.
Density = Mass/Volume = 120 grams/7 ml = 17.142857... grams per ml.