A 0.648 g sample of a mixture containing only NaBr and CaBr2 is dissolved in water. An excess of an aqueous solution of

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A 0.648 g sample of a mixture containing only NaBr and CaBr2 isdissolved in water. An excess of an aqueous solution of Pb(NO3)2 isadded. The PbBr2 that forms is filtered, dried, and weighed. Themass of PbBr2 is found to be 1.18 g. What is the mass of Br− ionsin the sample?
mass of Br−Br− ions:
g
What is the mass percent of Br−Br− ions in theoriginal sample?
mass percent Br−:Br−:
%
What is the percent composition by massof NaBrNaBr and CaBr2CaBr2in the sample?
mass percent NaBr:NaBr:
%
mass percent CaBr2:CaBr2:
%