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% and grams of NaCl solution?

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What do you mean by: " w/w is mentioned it is assumed to be w/vol"?

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  1. since no density , w/w is mentioned it is assumed to be w/vol   so 45 grams of NaCl = 0.6Vol

    45/0.6 = 75 mL containing 45 grams is 60% NaCl

    .75 x 75 = 56.25 grams of NaCl to make a 75% solution   so 56.25g-45.0g = 11.25 more grams of NaCl

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