93.2 ml of a 2.03 m potassium fluoride (kf) solution is diluted with 3.92 l of water

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.

heat or electricity in the atmosphere- c.

the answer to your question is c.

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