Need help with a Chemistry % Composition Problem!?

  • Thread starter Thread starter bluefishluck
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bluefishluck

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MgCl2 often occurs in table salt (NaCl) and is responsible for caking of the salt. A 0.5500g sample of table salt is found to contain 61.20% Cl, by mass. What is the percent MgCl2 in the sample?

I have been having trouble with this problem forever!!! So far, I've come up with:

% Cl in sample = (x)%Cl in MgCl2 + (1-x)%Cl in NaCl

But I don't know where the mass would come into play. Help!!!
 
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