Chemistry
posted by Sally .
You measure one edge of a cube using a meter stick marked in centimeters. Unfortunately, the edge is longer than 1 m. You mark the 1m point on the cube edge with a pen and then, using a 15cm ruler marked in millimeters, measure the remaining distance to be 1.40cm.
(a) What is the length of the edge in centimeters?
(b) What is the volume of the cube in cubic centimeters? (Remember, the lengths of all edges of a cube are equal.) Watch your significant figures. Use scientific notation if you have to.
(c) The cube has a mass of 111 kg. What is its density in grams per milliliter? Watch your significant figures.

Im doing this assignment too!!

a)1 meter = 100 cm, so the length of the edge is 100 + 1.40 = 101.40 cm but watch the number of s.f..
b)volume = edge^3.
c)density = mass/volume 
You have a cube with a side measurement of 3cm. The mass of the cube is 78g. What is the density of the cube?