Question

A piece of styrofoam has a mass of 15.0 grams and is the shape of a cube with each edge measuring 44.5 mm. Calculate the density of this object in grams per cubic centimeter.

A) 0.170g/cm^3
B)2.96g/cm^3
C)1.70 x 10^3 g/cm^3
D) 296 g/cm^3
E) 667 g/cm^3

//Im really bad at Chemistry and my final is just around the corner. Someone please help this desperate child in need!//

Answer 1

Density is calculated as mass divided by volume. We are given the mass of 15.0 grams, so we need to find the volume. For a cube, volume is calculated as (length of side)^3, so in this case, we have the length of a side as 44.5 mm, which is equivalent to 4.45 cm.
Volume = (4.45 cm)^3 = 88.1 cm^3
Then we divide mass by the volume:
Density = (15.0 grams) / (88.1 cm^3) = 0.170 g/cm^3
So the correct answer is A.