Reaction ,h2+i2 gives 2i,h=12.40 what is the heat of formation of hi
Answers
Answer:
Given the following reaction: H2(g)+I2(s) ? 2HI(g) with a ? H of 52.9 kJ. What is the change in enthalpy for the following reaction: HI(g) ? � H2(g)+� I2(s)? Express your answer in kJ. Enter only a numerical value, do not enter units.
2. How much heat is released during the formation of 3.78 mol HCl(g) in this reaction: H2(g)+Cl2(g) ? 2HCl(g) with a ? H of -184.6 kJ. Express your answer in kJ. Enter only a numerical value, do not enter units.
3. What will be the final temperature if a 4.00 g silver ring at 41.0 � C if it gives off 22.0 J of heat to the surroundings. The specific heat capacity of silver is 0.235 J/(g C). Express your answer in � C. Enter only a numerical value, do not enter units.
4. Let's say you hold some ice in your hand. The ice melts and your hand feels cold. Is the reaction H2O(s) ? H2O(l) endothermic or exothermic? Is the change in enthalpy of the reaction positive or negative. Enter a letter, only enter a letter.
A) (endothermic, positive)
B) (endothermic, negative)
C) (exothermic, positive)
D) (exothermic, negative)
5. B5H9(l) is a colorless liquid that will explode when exposed to oxygen. How much heat is released when 0.211 mol of B5H9 reacts with excess oxygen where the products are B2O3(s) and H2O(l). The standard enthalpy of formation of B5H9(l) is 73.2 kJ/mol, the standard enthalpy of formation of B2O3(s) is -1272 kJ/mol and that of H2O(l) is -285.4 kJ/mol. Express your answer in kJ. Enter only a numerical value, do not enter units.