Explore BrainMass
Share

Heat in Reactions

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

[show your work and note what formulas you used]

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?

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

Solution Preview

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

This Solution contains calculations to aid you in understanding the Solution to these questions.

\$2.19
Similar Posting

Finding the Heat of Reaction (Enthalpy) from Heats of Formation

Calculate the heat of reaction at the standard reference state for the following reactions:

2CaO(s) + 2MgO(s) + 4H2O(l) ----> 2Ca(OH)2(s) + 2Mg(OH)2(s)

NaCl(s) + 2SO2(g) + 2H2O(l) + O2(g) ----> 2Na2SO4(s) + 4HCl(g)

n-C4H10(g) ----> C2H4(g) + C2H6(g)

View Full Posting Details