The mass of NaCl needed = 1.461 g
Further explanation
The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. Concentration shows the amount of solute in a unit of the amount of solvent.
Molality shows how many moles are dissolved in every 1000 grams of solvent.
[tex]\tt molality(m)=\dfrac{mol~solute}{kg~solvent}=\dfrac{mol~solute\times 1000}{mass~solvent(g)}[/tex]
Given
1 molal solution
25 g water = 0.025 kg
Required
the mass of NaCl
Solution
Input the value :
molality = (mass of NaCl/molar mass g/mol) / 0.025 kg water
1 = (mass/58.44) / 0.025
mass = 0.025 x 1 x 58.44
mass = 1.461 g
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