0
What does the negative sign on the value of an enthalpy of formation indicate?
Wiki User
∙ 13y ago
A negative enthalpy of formation indicates that energy is evolved.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What does negative sign if the value of magnification of a mirror indicate?
It means that the pre-image and image are on opposite sides of the centre of magnification.
What does a negative add a positive equal?
If the absolute value of the negative is bigger than that of the positive, then the answer is negative. If the absolute value of the negative is the same, then zero. If the absolute value of the negative is smaller, then positive. Absolute value is the value ignoring the sign.
Will a negative number to the fifth power be a positive or negative value?
The result will be a negative value.
Can an absolute value equal a negative?
An absolute value can not be negative.
Does a negative value multiplied by a negative value eguals a negative?
No, like signs multiply to positive, unlike to negative.
What best describe the enthalpy of formation of a substance?
The enthalpy of formation of a substance is the energy change when a substance is formed from its elements in their standard states. It represents the heat energy released or absorbed during the formation process. A negative value indicates that the reaction is exothermic, while a positive value indicates an endothermic reaction.
The change in enthalpy that accompanies the formation of a compound from its elements?
The energy change that happens when a substance forms from its elements (APEX)
What is Enthalpy of formation of chloroform?
The standard enthalpy of formation of chloroform (CHCl3) is -68.3 kJ/mol at 25°C. This value represents the heat released when one mole of chloroform is formed from its elements in their standard states.
If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of rea?
286 kJ
What is the heat of formation of NaCl?
The standard enthalpy of formation for sodium chloride is -411,12 kJ/mol.
Why is the enthalpy change of combustion always negative?
The enthalpy change of combustion is always negative because it involves the breaking of bonds in the reactants, which requires energy input, and the formation of new bonds in the products, which releases energy. The energy released during bond formation is greater than the energy required for bond breaking, resulting in a net release of energy, hence the negative value.
If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of reaction you use for this in?
The final value for the enthalpy of the reverse reaction used in a Hess's law problem would simply be the negative of the original value of the enthalpy of the forward reaction. This is because reversing a reaction changes the sign of the enthalpy change.
What does a negative value for the standard potential indicate?
the negative value for a standard potential indicates that the reaction is not spontaneous.
What is the enthalpy of formation value for nh4cl?
The enthalpy of formation for NH4Cl (ammonium chloride) is -314.4 kJ/mol. This means that when one mole of NH4Cl is formed from its elements in their standard states, 314.4 kJ of heat is released.
Which is true of the enthalpy of a reaction?
Its value does not depend on which reactions are added.
What is true of the enthalpy reaction?
The enthalpy of a reaction is a measure of the heat energy exchanged with the surroundings at constant pressure. A negative enthalpy change indicates an exothermic reaction, where heat is released. A positive enthalpy change indicates an endothermic reaction, where heat is absorbed.
What is the enthalpy of formation of sucrose?
I can not find this in any literature but using a theoretical calculation the enthalpy of formation of fructose is -1087.32 kJ/mol. This calculation was made using Spartan 08's T1 model. This method uses a combination of ab initio calculations and basis sets to create a correlated model. For a comparison, using the same calculation glucose's enthalpy of formation was calculated to be -1038.63 kJ/mol. Wikipedia reports the enthalpy of formation of glucose to be −1271 kJ/mol, though no citation is provided, so assuming this value is accurate there is an 18.3% error in the glucose calculation. I am curious as to where this value was obtained since there is no entry for the heat of formation of glucose on NIST nor that I can find in the CRC handbook.
