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Pb(NO3)2 + KI ->? If a and b are roots of equation x^2 +x -12 =0 such that a>b then equation whose roots are 2a and 3b is ?Please!? Two review questions and an explanation would really help too on how you got the answer? The empirical formula of hydrazine is NH2, and its molecular mass is 32.0 grams. What is its molecular formula? How do i confirmed the identity of a person saw over the internet?