Answer:
74 g/mol
Explanation:
Using a periodic table, we can determine the molar mass by adding together 1 Ca, 2 O, and 2 H. This turns out to be approximately (40+32+2) = 74 g/mol
Answer A
Chlorine is usually prepared by electrolysis of molten NaCl or by electrolysis of brine.
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3 NaOH + FeBr3 = 3 NaBr + Fe(OH)3
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Heat up the solvent. This will cause the molecules of the solvent to become more energized and "expand" to allow for more solvent to be added. However, once the solvent cools down, the extra solute may fall out as a precipitate.
This is how rock candy is made, by the way.