The percent by mass of calcium hydroxide in the solution : 15.41%
<h3>Further explanation</h3>
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. The concentration shows the amount of solute in a unit of the amount of solvent.
Mass of solute (Ca(OH₂-Calcium hydroxide) : 28.5
Mass of solution = 185 g

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Explanation:
Answer:
yes it is true.
Ice floats on the surface of water because ice is less dense than liquid water
Explanation:
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6.02 times 10 to the 23 power, which is Avogadros number