What energy transformations took place in transforming chemical energy into kinetic energy? How many energy transformations can
2 answers:
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Answer: Mole Fraction of solute = 0.0790
Molality of solute = 4.761 mol/kg
Explanation: We are given that NaOH is 16% by mass in an aqueous solution which means that in 100gms of solution there is 16gm of NaOH present.
Mass of NaOH in aqueous solution = 16gms
Mass of water in aqueous solutin = 84gms
We need to calculate the mole fraction and molality of the solute and here solute is NaOH because solute is that substance in the solution which is present in low quantity.
To calculate the mole fraction, we will use the formula
and now to calculate mole fraction, we first need to find out the moles which can be calculated by
Molar mass of NaOH = 40g/mol
Molar mass of = 18g/mol
Moles of NaOH = 0.4mol
Moles of water = 4.66mol
So,
Mole fraction of NaOH = 0.0790
Now, to calculate molality, we use the formula
mass of solvent (in kg) =
Mass of solvent = 0.084kg
and we have already calculated the moles of solute above, by putting the values in the above equation, we find the molality.
Molality of NaOH = 4.761 mol/kg.