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November 12th, 2008, 01:50 PM   #1
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mass percent

Calculate the percent by mass of sodium chloride if 20.0 g of sodium acetate is dissolved in enough water to make 200 g of solution.

Can someone please help me figure out how to solve this? Thanks soo much.
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November 12th, 2008, 02:20 PM   #2
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Re: mass percent

Total grams of sodium: 20 grams * weight of sodium / weight of sodium acetate
Total grams of NaCl (assuming the solution has plenty of chlorine): total grams of sodium * weight of NaCl / weight of sodium
Mass fraction: Total grams of NaCl / 200 g.
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November 13th, 2008, 12:58 PM   #3
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Re: mass percent

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Originally Posted by daydreembelievr
Calculate the percent by mass of sodium chloride if 20.0 g of sodium acetate is dissolved in enough water to make 200 g of solution.

Can someone please help me figure out how to solve this? Thanks soo much.
The problem statement seems to be missing something. Where did the chloride come from - how much and what form?
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November 13th, 2008, 02:06 PM   #4
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Re: mass percent

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Originally Posted by mathman
The problem statement seems to be missing something. Where did the chloride come from - how much and what form?
I assumed that there were unlimited amounts in the solution. I think that's the usual way of doing things.
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