chem

posted by Anonymous

How many pounds does 40.9 in3 of gold weigh? (The density of gold is 19.3 g/cm3, 2.54 cm = 1 in, and 454 g = 1 lb.)

Note these are not large volumes--a cup of water is about 30 in3.

So I tried this question and got 34.73, which isn't right. I used this: (1 in)3 = (2.54 cm)3
Path: in3 --> cm3 --> g --> lbs
can someone help please?

  1. DrBob222

    Why not show your work and let me find the error? It's easier that way for me to know what went wrong.

  2. Anonymous

    okay i just tried it again by doing did (40.9*2.54*19.3)/454 and got 4.42. does that sound right?

  3. DrBob222

    No. You didn't cube 2.54.

  4. Anonymous

    okay so its 28.49

  5. DrBob222

    Yes, but you're only allowed 3 significant figures (from the 19.3 and 40.9) so you should round the answer to 28.5 pounds. I think what your prof wanted you to see was that a cup of gold is quite heavy at almost 30 pounds.

  6. Anonymous

    okay thanks!

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