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26 January, 02:50

If 255 g of water has 10.0 g of nacl dissolved into initially, how much nacl must be added in order to raise the mass percent of nacl by 10%

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  1. 26 January, 04:57
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    Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. To calculate percent by mass, you need to determine two things: the mass of just the element, and the molar mass of the whole compound. We calculate as follows:

    .10 g NaCl / g NaCl + Water = (10.0 g NaCl + x) / (10.0 g + 255 g + x)

    x = 18.33 g NaCl needed
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