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    Heat in Reactions

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    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

    1. How much heat is needed to decompose 505 g of the oxide?

    2. If 270. kJ of heat is absorbed, how many grams of mercury form?

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    https://brainmass.com/chemistry/reaction-stoichiometry/heat-in-reactions-58437

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    Stoichiometry Problem

    A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide.

    2 HgO(s) ----> 2 Hg(l) + O2(g)

    deltaHrxn = 181.6 kJ

    1. How much heat is needed to decompose 505 g of the oxide?

    We determine the molar mass of HgO. By looking up the masses in the Periodic Table, we find that HgO ...

    Solution Summary

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