Calculate the standard enthalpy of sublimation (sub H) at 298K ...

[storky111]

Calculate the standard enthalpy of sublimation (sub H) at 298K for water using the following thermochemical equations
 
  H2O(s) = H2O(l); fus H = +6.1 kJ mol-1
   H2O(l) = H2O(g); vap H = +44.0 kJ mol-1
 
  A) +37.9 kJ mol-1
  B) -37.9 kJ mol-1
  C) +50.1 kJ mol-1
  D) +44.0 kJ mol-1

Question 2

Which one of the following is the strongest weak acid?
 
  A) HCN (Ka = 4.9  10-10)
  B) HClO (Ka = 3.0  10-8)
  C) HNO2 (Ka = 4.5  10-4)
  D) HF (Ka = 6.8  10-4)

[karlss]

Answer to Question 1

C

Answer to Question 2

D

[storky111]

TYSM

[smrtceo]

Excellent