rogerxd45 Posted December 20, 2011 Share Posted December 20, 2011 first off this is not home work, and second i hope i put this in the correct area if not i am sorry so i have an alloy i made that is made up of coin silver (90%Ag and 10%Cu) and Tin now i should have recorded the amounts of each i put in when i made it but i didnt so now i would like to know is there any way to mathematically figure out how much coin silver and how much tin is in the sample? i just want to know how much "coin silver" and how much tin is in the sample i dont need how much copper, silver and tin. (i hope that makes sense) so the density of coin silver is 10.339g/cm3 (calculated by multiplying the density of silver and copper by the percentage of each in the coin (.90 * 10.5) + (.10* 8.89)= 10.339g/cm3) i believe that is the correct way to do it the density of tin is 7.365g/cm3 the density of my sample is 8.454g/cm3 its mass is 30.9g volume is 3.655cm3 i would really like to know how to solve it as opposed to just giving me the answer. i dont even know if it is possible to figure out, im pretty sure it is but i have no idea how Link to comment Share on other sites More sharing options...
Bignose Posted December 20, 2011 Share Posted December 20, 2011 Assuming that the densities do combine linearly, which I don't think is accurate in too many cases in general (I guarantee it does NOT except in special cases for liquids and gases; I admit I don't know about metals, but I'd think that melting two or more of them together would bring about some non-linear effects from the atom's interactions), your measurement of the mass gives you the data you need. Remember that density*volume = mass. You have the mass from your measurement. And you have the parts that make up the density*volume (two or three parts, depending on how you want to look at it). Link to comment Share on other sites More sharing options...
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