Answer:
8.3mL
Explanation:
According to the question, the initial volume of a measured amount of water is 12.5mL. Karen then adds a rubber stopper that weighs 2.3grams. This increases the volume of the water.
The increase in the volume of the water is attributed to the rubber stopper. Hence, to calculate the volume of the rubber stopper, we subtract the initial volume of the water from the final volume. i.e.
Volume of added rubber stopper = final volume of water - initial volume of water
= 20.8 - 12.5
= 8.3mL
Hence, the volume of the rubber stopper is 8.3mL
