ANy suggestions or websites would be grealty appericated...A cube neasures 35.5 on a side. It weighs 125 grams. Calcualte the volume for the cube. Units signficant digits?? I think this cube is 35.5 on each side.. What is the density of the cube? Units significant digts? IF this cube is aluminum. The accepted density for aluminum is 2.7 Calculate the % error?
2007-09-03 03:56:30 · 1 answers · asked by Steven V 2 in Science & Mathematics ➔ Chemistry
If it is a cube then all three sides are 35.5.
You do not state the units of side so they are assumed to be cm's.
Volume(Cube) = 35.5cm x 35.5cm x 35.5cm = 44738.875 cm^3
Density is mass divided by volume, so;_
Density = 125 g / 44738.875 cm^3 = 2.79 X 10^-3 g/cm^3
You do not quote the units of 2.7 but assuming they are g/cm^3, then % eerror= 2.7/2.79 x 10^-3 x 100 = 9.68%
NB The above are hypothetiical figures. When draughting the question the units need to be quoted. You quote grams for the mass, but give neither any units for 35.5 nor 2.7.
2007-09-03 04:12:41 · answer #1 · answered by lenpol7 7 · 0⤊ 0⤋