A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) → 2 Hg(/) + O2(g) AHrxn = 181.6 k) (a) How much heat is needed to decompose 560. g of the oxide? 4.0 kJ (b) If 264 kJ of heat is absorbed, how many grams of mercury form? 4.0 g Submit Answer

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