In the reaction mgcl2 + 2koh mg(oh)2 + 2kcl, if 3 moles mgcl2 are added to 4 moles koh, what determines how much mg(oh)2 is made?
a. the amount of mgcl2 + koh
b. the amount of kcl
c. the amount of mgcl2
d. the amount of koh

The best and most correct answer among the choices provided by your question is the first choice or letter A.

The amount Mg(OH)2 made depends on the amount of MgCl2 + KOH.

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Solubility would be your answer.

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck