determining mass is grams

[tml2904]

Ok here is the problem,


a cube of platinum of edge length is 0.034 mm and density is 21.4g/cm^3

I need to determine the mass in grams?

so i thought that i first needed to convert 0.034mm into cm^3, I got 3.9 X 10 to the -9

and take that number a multiply by itself 3 times for volume to get 6.07 X 10 to the -23
and multiply that times density to get mass......i think i am way off

Can anyone help?

 

[Aladdin]

~

density = m/v ;

volume = side*side*side ; being a cube v =side^3 ;

m = v*d .

 

[tml2904]

yes, but then how to I get the mm to cm cubed

 

[Deleted member 4993]

Ok here is the problem,


a cube of platinum of edge length is 0.034 mm and density is 21.4g/cm^3

I need to determine the mass in grams?

so i thought that i first needed to convert 0.034 mm into cm^3, I got 3.9 X 10 to the -9

That does not make sense - what you should do is to convert mm to cm and then find volume in cm[sup:y0b0noph]3[/sup:y0b0noph] (as shown below).

and take that number a multiply by itself 3 times for volume to get 6.07 X 10 to the -23 (No - see below)
and multiply that times density to get mass......i think i am way off

Can anyone help?

Edge of cube = 0.034 mm = 3.4 * 10[sup:y0b0noph]-3[/sup:y0b0noph] cm

Volume of cube = (3.4 * 10[sup:y0b0noph]-3[/sup:y0b0noph])[sup:y0b0noph]3[/sup:y0b0noph] cm[sup:y0b0noph]3[/sup:y0b0noph]

mass of cube = 21.4 * (3.4 * 10[sup:y0b0noph]-3[/sup:y0b0noph])[sup:y0b0noph]3[/sup:y0b0noph] g