Step-by-step explanation:
To calculate the number of grams of NaCl needed to make a 10% solution of 3L, we need to know the density of NaCl and the definition of a 10% solution.
Assuming that the density of NaCl is approximately 2.16 g/mL, a 10% solution means that 10% of the final solution's total volume will be NaCl.
Therefore, to make a 10% solution of 3L, we need:
3 L x 0.10 = 0.3 L of NaCl
To convert the volume of NaCl needed into mass, we use the density of NaCl:
0.3 L x 2.16 g/mL = 0.648 g/mL
Therefore, we need approximately 648 grams of NaCl to make a 10% solution of 3L.