A 1.00 L solution contains 4.00×10-4 M Cu(NO3)2 and 3.000×10-3 M ethylenediamine (en). The Kf for Cu(en)2^2+ is 1.00×10^20. What is the concentration of Cu2+(aq ) in the solution?

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elements make up everything, and they combine to make compounds.

the answer is c

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.