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Calculate the number of grams of 4.4 % (m/m) NaCl solution that contains 6.20 g of...

Calculate the number of grams of 4.4 % (m/m) NaCl solution that contains 6.20 g of NaCl.

Calculate the volume in milliliters of 30 % (m/v) NaF solution that contains 4.3 g of NaF.

Calculate the volume in milliliters of 7.0 % (v/v) ethanol solution that contains 10.2 mL of ethanol.

Help please! I do not understand what to do with the percents.

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