78.7 grams
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milliliters is volume, milligrams is mass (weight) unless you include the density, the question is meaningless. (if it's water ... then 80 ml)
Find the mass of an empty container using a balance. Fill the container with 100 ml of water and measure the mass again, The difference between the two measurements is the mass of 100 ml of water.
No, mL are a unit of volume and grams are a unit of mass. 1 mL of water has a mass of 1 g
1 gram
The water has a mass of roughly 560 grams, depending on its purity and temperature. We have no idea what the mass of the balloon is.