The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.
HOW TO CALCULATE MASS?
The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles must first be calculated by using the following expression:
Molarity = no. of moles ÷ volume
no. of moles = 0.249 × 0.1208
no. of moles = 0.03moles
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
mass of NaCl = 0.03 × 58.5 = 1.76g
Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.
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