Final answer:
To determine the density of a fluid, measure its mass and volume separately, and then use the formula density = mass/volume. The density of a 240-g rock displacing 89.0 cm³ of water is found by dividing the mass by the displaced volume. Archimedes' principle can also be used, but requires knowing the object's or fluid's density beforehand. Option C is correct.
Step-by-step explanation:
To experimentally determine the density of a fluid, the most appropriate option from the given choices is to measure the fluid's volume and mass separately, as in option C. You first need to accurately measure the mass of the fluid using a balance.
Then, the volume of the fluid can be determined by pouring it into a graduated cylinder or any other volume-measuring device. After obtaining both mass and volume, you can calculate the density using the formula density = mass/volume.
An example of this method is determining the density of a rock by submerging it in water. If a 240-g rock displaces 89.0 cm³ of water, the density of the rock is calculated by dividing its mass (240 g) by the volume of water displaced (89.0 cm³), yielding a density value.
Archimedes' principle is another method that can be used by measuring the buoyant force an object experiences when submerged in the fluid. However, this method is more indirect and involves knowledge of the object's density to find the fluid's density, or vice versa.