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Explain why humus have higher cation exchange capacity (CEC= 200 to 400 cmol+/kg) than montmorillonite (CEC = 80 to 100 cmol+/kg).

a) Calculate the work when 617 grams of solid CO2 sublimes at 221.5K.
B) Calculate the work when 1 mole of solid CO2 sublimes at 221.5K
what is the best method to purify iodine?
I am a food technologist. my question is ..what volume to spiked on 0.5g food to get 5pbb of stock solution is 100ppb aflatoxin (B1,B2,G1 ,G2)
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