A liter of water weighs 1 kilogram or 1000 grams. Half a liter (.5 l) will weigh half that, or 500 grams.
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No, 400 grams is a measure of mass, while 0.5 liters is a measure of volume. The two are not directly comparable unless you know the density of the substance in question.
1 grams
1 kilogram = 1000 grams fraction = 400 / 1000 = 40 / 100 = 4 / 10 = 2 / 5 So 400 grams is two fifths of 1 kilogram
400 ml = 0.4 liters the % of 2 liters = (0.4/2) x 100 = 20 %
1 gram = 10^-3 kilograms 400 grams x (1 kilogram/1000 grams) = .4 kilograms the grams cancel out and you are left with the answer above. you an also just move the decimal place left 3 places.
Yes, 500ml of water has a mass of 500g. The density of water is approximately 1g/ml, so 500ml of water would weigh 500g.