Answer:
They give off their own light energy
Explanation:
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B. is ur answer I bieleve
Answer:
are there any options for us to choose from? or is it just fill in the blank
The reaction will be: FeBr2 + K --> KBr + Fe
Balancing gives: FeBr2 + 2K --> 2KBr + Fe
The molar mass of FeBr2 is 55.85 + 2*79.9 = 215.65 g/mol.
We divide 40 g / 215.65 g/mol = 0.185 mol FeBr2
Based on stoichiometry:
(0.185 mol FeBr2)(2 mol KBr/1 mol FeBr2) = 0.370 mol KBr
The chemical change would occur faster in Beaker X due to the fact that the contents are warmer.
