A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) 2 Hg(l) + O2(g) Hrxn = 181.6 kJ (a) How much heat is needed to decompose 546 g of the oxide? kJ (b) If 279 kJ of heat is absorbed, how many grams of mercury form?

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