Chemistry

Problem

To prepare 100.0 g of an NaCl solution that is 15.0 % NaCl by mass, a technician has stock solutions that are 10.0 % and 25.0 % NaCl by mass. What mass of the 25.0 % solution should the technician use? a)

66.7\ \text{g}

25.0\ \text{g}

33.3\ \text{g}

60.0\ \text{g}

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