Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Conversion Help Please

  1. Sep 10, 2006 #1
    How many cubic centimeters of ore 0.25% by mass silver must be processed to obtain 2.0 pounds of silver? The density of the ore is 7.0 g/cm cubed. cm cubed; 1.00 pound=454 g. Assume that the process is 100% efficient.

    I get the answer of 520 but the answer is 52000 and i dont understand why im so off. Can someone help me please i would really appreciate it.

    Thank you :smile:
  2. jcsd
  3. Sep 10, 2006 #2


    User Avatar
    Science Advisor

    This is just a guess, but since your answer is off by a factor of 100, I bet the problem came when you did not divide .25% by 100 in your calculations (.25% = .0025 in decimal form).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook