Answer to Question #111651 in General Chemistry for Vicky

Question

2) Compute ∆Hf◦ for the following reaction in KJ:

2 SO3(g) −−→ 2 SO2(g) + O2(g)

given ∆Hf◦(SO2(g))=-297 kJ/mol and ∆Hf◦(SO3(g))=-396 kJ/mol

A } -198
B ) 198
C ) -99
D ) 99


.The specific heat of a metal A is 0.2J/g C,and the specific heat of a metal B is 0.4J·g ·C . If heat is added to each metal at 25 ◦C
A)A will reach a higher temperature
B)B will reach a higher temperature
C)both metals will reach the same temperature

Answer 1

2 ( - 297) - 2 (-396) = 198 kJ/mol

Answer B ) 198!

Specific heat capacity is the measurement of how much energy (in J) has to be added to 1 g of a substance to increase the temperature of that substance by 1^oC. Simply, substances with a low specific heat capacity heat up quickly. So the answer is:

A) A will reach a higher temperature