Chemical Thermodynamics Question 257
Question: When $ 0.5g $ of sulphur is burnt to $ SO_2,,4.6,kJ $ of heat is liberated. What is the enthalpy of formation of sulphur dioxide [KCET 1998; AFMC 2001]
Options:
A) + 147.2 kJ
B) - 147.2 kJ
C) - 294.4 kJ
D) + 294.4 kJ
Show Answer
Answer:
Correct Answer: C
Solution:
$ S+O_2\to SO_2,\Delta H_{f}=-,4.6,kJ $
$ \because $ 0.5 gm. of sulphur on burning produce 1gm of $ SO_2 $
$ \therefore $ 32 gm of sulphur on burning produce 64 gm.. of $ SO_2 $
$ \therefore \Delta H=(,-,4.6,kJ,)\times 64=-,294.4,kJ $ .
