Posted by Anonymous on Thursday, July 26, 2012 at 9:31am.
SciMann
Best Answer - Chosen by Voters
Let UNITs guide you; always USE THEM in your calculation to prevent errors
moles of Na in samp = 0.78 g/ atwt Na = ??
x moles NaBr * MW NaBr + (moles Na - x moles NaBr) * MW NaCl = 2.01 g
x moles NaBr = [2.01 g - moles Na * MW NaCl] / [MW NaBr - MW NaCl] = ??
g NaBr = x moles NaBr * MW NaBr
wt fraction = g NaBr/2.01g = ?? (0.049 wt fraction of NaBr)
Plug and SOLVE
Or do you need more than this?
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