Question

A student using a 100mL graduated cylinder that contained 50.00mL of water. Th volume of the water increased to 57.50mL. The density of the object was 7.85 g/cm^2. How many grams did the metal object weigh?

Answer 1

mass object = volume x density
volume = 57.50-50.00 = ?
density = given.
Solve for mass object.

Answer 2

isn't the density given in g/cm^2 though? and the mass is mL. It seems like there are 2 different units here. They also want the answer in grams.

so m= d x v

7.50mL x 7.85 g/cm^2= 58.9 (what unit mL or g.cm^2?)

Answer 3

1 mL = 1 cm^3 = 1 cubic centimeter = 1 cc.
7.50 cc x 7.85 g/cc = 58.9 grams. Note that cc in numerator cancels with cc in the denominator.