What is the mass of a 215.7 ml object that has a 1.85g/ml density

Answer 1

density is always in mass/unit volume. If you have the volume, it is easy to calculate the mass.

Something that will help in most chemistry problem is to follow the units. If the answer needs to be in grams then when set the equation up the units must cancel such as to yield grams.

In this case density (g/ml) * volume (ml) will yield grams.

Therefore the answer equals 1.85g/ml * 215.7ml. I leave the arithmetic to the student.

Answer 2

1.85 g/mL * 215.7 mL. Notice that mL appears in the denominator of the density and the numerator of the volume. Therefore, mL cancels out and leaves grams when you multiply density and volume. The mass is 399 g.