Initially, the total mass of the system (glass + water + ice) is 50 g + 400 g + 75 g = 525 g. After 20 minutes, 25 g of ice has melted (from 75 g to 50 g), which means 25 g of water is added to the liquid water. Therefore, the new mass of liquid water is 400 g (initial) + 25 g (melted from ice) = 425 g.
A 50 gram glass holds 400 grams of liquid water and 75 grams of ice. After 20 minutes the mass of ice is 50 grams. In 1-2 sentences, assuming no evaporation or sublimation has occurred, calculate the mass of the liquid water at this time and explain how this is found
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