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chemistry

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a mixture of NaCl and NaBr has a mass of 2.06 g and is found to contain 0.75 g of na
what is the mass of NaBr in the mixture ?

  • chemistry - ,

    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?

  • chemistry - ,

    .04

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