Ability to moderate temperatures is not a property of water
Answer:
150 mL of the 30% alcohol mixture and 30 mL of the pure water will we need to obtain the desired solution.
Explanation:
Let the volume of 30% alcohol used to make the mixture = x L
For 25% alcohol:
C₁ = 25% , V₁ = 180 mL
For 30% alcohol :
C₂ = 30% , V₂ = x L
Using
C₁V₁ = C₂V₂
25×180 = 30×x
So,
x = 150 mL
Pure water = 180 mL - 150 mL = 30 mL
<u>150 mL of the 30% alcohol mixture and 30 mL of the pure water will we need to obtain the desired solution.</u>
Explanation:
Water is a polar solvent as the hydrogen and oxygen atom has large difference in their electronegativities.
Oxygen atom is highly electronegative as compared to hydrogen atom therefore, it pulls the electrons of hydrogen atom closer towards itself.
As a result, two poles will create forming a partial positive charge on the hydrogen atom and partial negative charge on the oxygen atom.
Thus, we can conclude that high electronegativity difference between oxygen and hydrogen is the cause of polarity in water molecules.
Molality is the number of moles of solutes in 1 kg of solvent.
the molality of solution to be prepared is 2.0 molal.
therefore 2 moles in 1 kg water.
the mass of Li₂S required is - 46 g/mol x 2.0 mol = 92 g
the mass in 1 kg of solvent is - 92 g
Therefore mass of Li₂S required in 1600.0 g is - 92 g/kg x 1.6 kg = 147.2 g
