Processing 0.25% Silver Ore to Obtain 2 Pounds

[blue4882]

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 don't understand why I am so off. Can someone help me please i would really appreciate it.


Thank you

 

[mrjeffy321]

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).