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well, idk what I've done wrong, but if you find it, just point it out: A1 + A2 + A3 = ATotal A2 + A3 = 5A1/ 2 Since A1 = 3 x 2 = 6 ATotal = 15+6 = 21 I've forgotten whether 'evaluate' changes what the question is asking....sorry about that!

Is the answer 21?

I think what they are trying to say is that the valence electron from the metal cation is excited i.e. 1 of the e- goes from the 2p6 state into 3s1, which is similar to the energy level configuration of the respective metal atom, but that's wrong to say because an ion is formed by the lack/...

0.15 x 0.05 = 0.25 x v2 v2 = (0.15 x 0.05)/0.25 = 0.03

1L = 1,000mL therefore 0.03L x 1000 = 30mL

Use c1v1 =c2v2 So, 0.15 x 0.05 = 0.25 x v2 v2 = 0.03L = 30mL Therefore, solution B is 30mL