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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
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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 is the enthalpy of formation value for nh4cl?
Approximately -82kJ/mol
What is heat of reaction and enthalpy of reaction?
Heat of reaction and enthalpy of reaction are the same thing. Enthalpy, or the heat transfer, cannot be measured, however we can measure the CHANGE of enthalpy which is shown by a value of ∆H. This measured in kilojoules per mole of reactant. (KJ/mol)This value may be positive or negative. For endothermic reactions (which absorb heat), the ∆H value is always positive. For exothermic, where heat is released, the value is negative.
What is the heat of formation of NaCl?
The standard enthalpy of formation for sodium chloride is -411,12 kJ/mol.
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 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.
The Literature value of enthalpy ionization of alanine?
the leterature value of ioniazation enthalpy of alanine
Why inductance value is negative?
Inductance is not negative. It is measured in henrys, and that is a positive value. Inductive reactance, however, is measured in ohms, and is commonly shown as negative to indicate that the current lags the voltage.
Is vaporisation an exothermic or endothermic process?
Any reaction categories into exothermic and endothermic based upon change in enthalpy of reaction. If difference in enthalpy of product and reactant comes positive value then it is termed as endothermic and if it is negative value then exothermic reaction. Usually, vaporisation is considered as exothermic due to release in energy.
True or False A large positive value of entropy tends to favor products of a chemical reaction?
True, a large positive value of entropy tends to favor products of a chemical reaction. However, entropy can be offset by enthalpy; a large positive value of enthalpy tends to favor the reactants of a chemical reaction. The true measure to determine which side of a chemical reaction is favored is the change in Gibbs' free energy, which accounts for both entropy and enthalpy, as calculated by: Change in Gibbs = Change in Enthalpy - Temp in Kelvin * Change in Entropy A negative value of Gibbs free energy will always favour the products of a chemical reaction.
What is the enthalpy and entropy change when ammonium chloride is dissolved in water?
The published value for an enthalpy change is 14.78 kJ/mol
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?
Its value does not depend on which reaction are added
