10 points for answer to EASY density question. ?

Question

The density of platinum is 21.45 at 20 degrees Celcius. Calculate the mass of 80.00 of platinum at this temperature.

Tell me what the answer is, and tell me how to work the problem. Thanks, I will give 10 points!

Answer 1

density equals mass divided by volume.  you dont have volume in your question, unless that's what that 80.00 is.  you didnt write any units either.  i will assume it is 80.00 mL

then your mass equals density * volume => 21.45 g/mL * 80.00 mL (assuming that the density given is in g/mL) which gives you 1716 grams.

Answer 2

As no units are given there are two choices.....

1...If the 80 is meant to be 80cc then, 80cc x 21/45g/cc = 1,716g. Pt. (The ' cc ' cancel).

2...Platinum Density = 21.45 grams per cubic centimetre. (21.45g/cc).

80 grams divided by 21.45 g/cc = 80g / 21.45g/cc = 3.73cc of Pt.

(The ' g ' cancel).

Answer 3

To find the answer to your problem we need the units for density, and the units for what ever is 80 (I assume it is some kind of volume).  Units are very important in chemistry.

1. What is density?  It is mass/volume.  So if the units match, if they don't convert, you can multiply your volume by the density to get mass.

Check what the units are, and when you write your answer don't forget to put the units down.