Discussion
The molarity of 0.75 mol of calcium hydroxide in 500 ml of solution is:
Answer: A
Molarity is moles of solute per litre of solution. The volume is 500 ml = 0.5 litre, so
\[ \begin{aligned} M = \frac{0.75\ \text{mol}}{0.5\ \text{L}} \\ &= 1.5\ \text{M} \end{aligned} \]The value 0.15 M comes from forgetting to convert millilitres to litres by the right power of ten, 0.002 M comes from dividing the volume by the moles, and 2 M would need only 1.0 mol in the same volume.
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