To calculate the density of the rock, follow these steps:
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Find the volume of the rock: The water level rose from 50 mL to 70 mL, so the volume of the rock is the difference: 70 mL - 50 mL = 20 mL.
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Use the density formula: Density is calculated using the formula density = mass/volume. The mass of the rock is given as 100 grams, and the volume we found is 20 mL.
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Calculate the density: Plugging the numbers into the formula, we get density = 100 grams / 20 mL = 5 grams/mL.
So, the density of the rock is 5 grams per milliliter.