Calculating liquid density from mass difference and volume

Steps:

• Measure the mass of the empty beaker.
• Pour liquid into the beaker and measure the combined mass.
• Subtract the empty beaker mass from the combined mass to find the liquid's mass.
• Measure the liquid's volume using a graduated cylinder, then divide mass by volume for density.

Why A is correct:

• Density is defined as mass divided by volume; A computes the liquid's mass by subtraction and divides by its volume, matching the formula ρ = m/V.

Why the others are wrong:

• B subtracts the liquid's mass (unknown) from the total, yielding the beaker's mass instead of the liquid's, which is circular and incorrect.
• C adds unrelated quantities without division, producing a nonsensical result unrelated to density.
• D only manipulates masses without volume or division, failing to compute density.

Final answer: A