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The pK_b of n-propylamine is approximately:
n-Propylamine is a weak base with K_b ~5Ă10âťâ´, pK_b = -log(5Ă10âťâ´) â 3.30. Closest is 3.32? Actually standard value ~3.32. But MDCAT often uses 3.28 or 3.32. Given options, 3.32 is common.
A cake recipe requires a round pan that is 8 inches in diameter. If someone wants to make a cake of the same depth but using a pan that is 12 inches in diameter instead, by what factor should the recipe ingredients be multiplied?
The volume of a cake (same depth) is proportional to the area of the base, which is proportional to the square of the diameter (or radius).
Factor $= \left(\dfrac{12}{8}\right)^2 = \left(\dfrac{3}{2}\right)^2 = \dfrac{9}{4} = 2\dfrac{1}{4}$
The recipe ingredients should be multiplied by $2\dfrac{1}{4}$.
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