Question

Aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 381 mL . Express your answer to three significant figures.

Answer 1

Answer:

Mass ≈ 1030g (Three significant Figures)

Explanation:

We were given;

Density = 2.70 g/mL

Mass = ?

Volume = 381 mL

The relationship between all three parameters mentioned above is given by the formular below;

Density = Mass / Volume

Upon solving for Mass, we have;

Mass = Density * Volume

Substituting the respective values;

Mass = 2.7 * 381

Mass = 1028.7g

Mass ≈ 1030g (Three significant Figures)

Answer 2

Multiply the volume by the density. 1 ml = 1 cm^3

1.11 g/cm^3 * 1 cm^3/mL * 386 mL = 428 g

All your units cancel out except for g which is what you would expect since you want units of mass.