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.
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That would be (5.8)/150 mass units per mL or 0.0386666 mass units per mL
depends what it is a ml of? ml of water is not as dense as ml of mercury for example
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.
1 ml of water has a mass of approx 1 gram so 50 ml = approx 50 grams. Suppose x grams of sugar are required for a 3% (by mass) solution. Therefore, x/(50+x) = 3/100 That is 97x = 150 so that x = 150/97 = 1.546 grams, approx.
150/250.