When heated, mercury(II) oxide decomposes into elemental mercury ...

[lbcchick]

When heated, mercury(II) oxide decomposes into elemental mercury and oxygen:
 
  2 HgO(s)  2 Hg(l) + O2(g) H = 181.6 kJ S = 216.4 J/K
  Estimate the temperature at which HgO should begin to decompose if the partial pressure of O2(g) is constant at 1.00 atm.
  A) -34.8C
  B) 34.8C
  C) 566C
  D) 840C

Question 2

A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is ________ atm.
 
  A) 1.5
  B) 7.5
  C) 0.67
  D) 3.3
  E) 15

[Eunice618]

Answer to Question 1

C

Answer to Question 2

C