Question

DENSITY HELP :) A 5.00 cm cube of magnesium has a mass of 217.501 g. What is he density of magnesium metal?

Answer 1

hey, is it chemistry? but it's not that you have formula to find out the density? it says d = m/v

Answer 2

Yes this is a chemistry question. Sorry I posted it in the wrong place. Its my first time on this website. I didn't mean to post it here.

Answer 3

ok, but you got it,

Answer 4

The formula?

Answer 5

I know it is D=m/v, but I am unsure what to do from there. Since it is a cube do I first do 5.0 *5.0*5.0 to get the volume?

Answer 6

\[d= \frac{m}{v}\] where m is mass and v is volume. you have mass is 217.501 and v = 5.00

Answer 7

no, 5.00 \(cm^3\)

Answer 8

oh ok so I do not need to find the volume of anything? Ok so once I do that I got 43.50 g/cm

Answer 9

Is that correct?

Answer 10

I don't calculate because it's quite simple but I think .. ok, let me do

Answer 11

alright thank you!

Answer 12

yes, but you should pay attention at significant figure.

Answer 13

Oh ok, so would it not be that? Since 43.50 is 4 digits?

Answer 14

The answer I got was = 43.5002 ---> 43.50?

Answer 15

I don't know, depend on the prof's requirement. to my prof, I have to get 4x10 , just 1 significant figure because 5.00 is 1 significant figure.

Answer 16

ok so if we did it like you said, what did you get as the answer? 43.5? or round up to 44?

Answer 17

Thank you for your help, I got my answer!

Answer 18

@Loser66 5.00 has 3 significant figures.

Answer 19

@desiretoinspirecindy Also note that units of your answer should be g/cm^3 not g/cm.

Answer 20

Ok THANK YOU! :)