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What is the mass density of a rock of mass 300 g that has ,the density is 3.00 grams ml the rock weighs 100 grams less in water than it does in air 200 100 the density of water is ml so 100 gram difference means 100 ml of water were displaced. xx 100 ml so the volume of the rock is 100 ml. density mass volume. density 300 100 ml ml
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