Final answer:
To calculate the mass of 2.85 L of butter with a specific gravity of 0.91, multiply the volume in milliliters (2,850) by the specific gravity (0.91), resulting in a mass of 2,593.5 g. After rounding to two significant figures, the mass is 2,600 g, which is not listed as one of the options given.
Step-by-step explanation:
The mass of a substance can be found by multiplying its volume by its specific gravity, which is a comparison of its density to the density of water (1 g/mL). Since the specific gravity of butter is given as 0.91, this means that 1 mL of butter has a mass of 0.91 g. To find the mass of 2.85 L (2,850 mL), we multiply this volume by the specific gravity:
- Mass of butter = volume of butter (mL) × specific gravity (g/mL)
- Mass of butter = 2,850 mL × 0.91 g/mL
- Mass of butter = 2,593.5 g
However, since the density has only 2 significant figures, we must round off the final answer to 2 significant figures. Therefore, the mass of 2.85 L of butter is 2,600 g, which is not one of the provided options. Be sure to confirm the accuracy of the question's details or the available options, as there may have been a mistake in the values presented.