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What mass of NaOH must be dissolved in water to prepare 1.50 L of 0.500 M solution? How far back does West Springfeild auto check driving record? The isosceles triangle theorem states that is two sides of a triangle are congruent ,then the angles opposite those sides are? Why can an individual receive platelets donated by anyone but must received only a particular type of whole blood? Prove that span (U ∪ W) = U + W, where U+W={u+w:u ∈ U and w∈W}?