4. Calculate the theoretical yield of alum in grams a. First, show how to calcul

Question

4. Calculate the theoretical yield of alum in grams a. First, show how to calculate the formula weight of alum. Be sure to include the mass of the 12 chemically bonded moles of water in the mass of each mole of alum. b. Then, convert moles alum to grams alum, showing your setup with cancellation of units. Calculate your yield of alum in grams: Mass of dried alum + weighing boat Mass of empty weighing boat Mass of dried alum = actualmeldofalinn - theoretical yield of alum Calculate your % yield of alum: % yield- x100%

Explanation / Answer

4) a) Chemical formula of alum is KAl(SO4)3.12H2O

Firstly verify in given formula how many no. of atoms and then write its atomic weight, Calculate the total Molecular weight of alum is

K = 39 * 1 = 39

Al = 27 *1 = 27

S = 32 * 2 = 64

O = 16 * 8 = 128

H2O =18 moles = 18*12 = 216gm

b) Molecular weight of alum is = 39+27+64+128+216 = 474gm

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