Kia is doing an experiment in the science lab. She is given a beaker containing 100 g of liquid. The beaker has markings on the side for measuring volume, and the water initially comes up to the 100 mL mark.
Kia accidentally places the liquid on a hot plate. By the time she realizes her mistake, half of the liquid has evaporated.
Kia still needs 100 g of liquid for her experiment. To find out how much liquid she needs to replace, she must re-weigh her liquid. However, the balance she used is now broken. The teacher tells Kia that she can determine how much water is left by observing the volume. The water now comes up to the 50 mL mark.
How much mass does Kia's remaining water have?
Answer (3)
Kia's remaining water has a mass of 50g. You can set it up as a proportion knowing that 100ml of water has a mass of 100g and thus 50ml of water would weight 50g
the correct answer is 50g
Kia's remaining water has a mass of 50 g since the volume of the remaining water is 50 mL and water has a density of 1 g/mL. Thus, by multiplying the volume by the density, we confirm that the mass is 50 g. This shows the direct relationship between volume and mass for water.
;
