To calculate the density of the rock, follow these steps:
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Determine the volume of the rock: Measure the change in water level in the graduated cylinder. The initial water level was 50 mL, and after adding the rock, it rose to 70 mL. Thus, the volume of the rock is 70 mL - 50 mL = 20 mL.
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Calculate density using the formula: Density is calculated by dividing the mass of the rock by its volume. The mass of the rock is 100 grams, and its volume is 20 mL. Using the formula: \[ \text{Density} = \frac{\text{mass}}{\text{volume}} = \frac{100 \text{ grams}}{20 \text{ mL}} = 5 \text{ grams/mL}. \]
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Final result: The density of the rock is 5 grams/mL.