- #1
AMan24
- 58
- 2
Homework Statement
Homework Equations
The Attempt at a Solution
2(255) - [(1)(159) + (1)(243)]
= +108KJ
The answer key says its b) -108KJ. Am i doing something wrong or is the book wrong?
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ΔHo, or standard enthalpy of formation, is the change in enthalpy that occurs in a chemical reaction when one mole of a substance is formed from its constituent elements in their standard states.
ΔHo can be calculated using the following equation: ΔHo = ΣnΔHof(products) - ΣnΔHof(reactants), where n is the number of moles of each substance and ΔHof is the standard enthalpy of formation for that substance.
ΔHo provides information about the energy changes that occur during a chemical reaction and can be used to determine the feasibility of a reaction. A negative ΔHo indicates that the reaction is exothermic, while a positive ΔHo indicates that the reaction is endothermic.
ΔHo is typically measured at a standard temperature of 25°C. However, as temperature increases, the value of ΔHo may also change due to changes in the energy levels of the reactants and products. Therefore, it is important to specify the temperature at which ΔHo is measured.
Yes, ΔHo can be negative, indicating that the reaction is exothermic and releases energy. This means that the products have a lower enthalpy than the reactants, resulting in a negative change in enthalpy.