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The enthalpy of formation of benzene is endothermic because it requires an input of energy to form from its elements in their standard states. The formation of benzene involves breaking the bonds in the elements and rearranging them to form the benzene structure, which results in an overall absorption of heat energy.
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What is the enthalpy of ammonium chloride?
The enthalpy of formation of ammonium chloride is -315.4 kJ/mol.
What is the enthalpy of formation for sodium sulfate?
The answer to this question must be in Perry's Chemical Engineering Handbook, or the CRC Handbook of Chemistry and Physics, or the JANAF Thermochemical Tables... I just don't have mine handy right now, and I need the same answer for a homework problem. These books have the enthalpy of formation for a myriad of substances. Go to your nearest library and look it up! Wink
If the solubility of KHT Potassium bitartrate increases with temperature increase what can you say about the sign of enthalpy change of the dissolution of KHTWhy?
If the solubility of KHT Potassium bitartrate increases with temperature, the enthalpy change of the dissolution of KHT is likely positive (endothermic). This is because an increase in solubility with temperature indicates that the dissolution process absorbs heat from the surroundings to proceed, resulting in a positive enthalpy change.
Is benzene reactive with bromine in the dark?
No, benzene is not reactive with bromine in the dark because the aromatic nature of benzene stabilizes its electron configuration. Without light or a catalyst, the reaction between benzene and bromine is not energetically favored.
What is the enthalpy and entropy change when ammonium chloride is dissolved in water?
When ammonium chloride dissolves in water, it absorbs energy from the surroundings, resulting in a positive enthalpy change (endothermic process). The dissolution also leads to an increase in disorder or randomness, resulting in a positive entropy change.
Is the enthalpy of formation for na2co3 endothermic or exothermic?
The enthalpy of formation for Na2CO3 is negative, which means it is exothermic. This indicates that the formation of one mole of Na2CO3 from its elements in their standard states releases heat energy.
What is the sign of the enthalpy change for an endothermic reaction?
Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the reaction therefore enthalpy change show positive sign in a endothermic reaction..
What is the difference of enthalpy of formation and the enthalpy of combustion?
The enthalpy of formation is the change in enthalpy that occurs when 1 mole of a compound is formed from its elements in their standard states. The enthalpy of combustion is the change in enthalpy that occurs when 1 mole of a substance is completely burned in oxygen. In short, enthalpy of formation is for the formation of a compound, while enthalpy of combustion is for the complete burning of a substance.
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)
Why does oxygen gas not have an enthalpy of formation but ozone does?
Oxygen gas (O2) does not have an enthalpy of formation because it is an element in its standard state, which has an enthalpy of formation of zero by definition. Ozone (O3), on the other hand, is a compound and has a defined enthalpy of formation because it is formed from its elements in their standard states.
What does the negative sign on the value of an enthalpy of formation indicate?
A negative enthalpy of formation indicates that energy is evolved.
How bond formation and bond breaking related to enthalpy?
Bond formation is an exothermic process, meaning it releases energy, while bond breaking is an endothermic process, meaning it requires energy input. The enthalpy change for a reaction is determined by the difference between the energy released from bond formation and the energy required for bond breaking. If more energy is released during bond formation than is required for bond breaking, the overall reaction is exothermic and vice versa.
What is process that involves absorption of heat?
endothermic reaction a positive enthalpy.
What is the enthalpy of calcium chloride?
The enthalpy of formation of calcium chloride is -795.8 kJ/mol.
What is an endothermic compound and what is an exothermic compound?
An endothermic compound absorbs heat or energy from its surroundings during a chemical reaction, causing a decrease in temperature. An exothermic compound releases heat or energy into its surroundings during a chemical reaction, causing an increase in temperature.
What is the standard enthalpy of formation for butane?
the standard enthalpy change of vaporization DHov is the enthalpy change when one mole of a substance is transformed into a gas enthalpy change is the term we use to describe the energy exchange that occurs with the surroundings at a constant temperature and pressure so to work it out, use the formula DH = cmDT DH - the enthalpy change c - the specific heat capacity of butanol (kJ kg-1 °C-1) m - the mass of butanol heated (kg) DT - the change in temperature of the butanol (°C) so there is no general enthalpy change of butanol, it depends on the factors above. the specific heat capacity of butanol, the mass of butanol heated, and the change in temperature of the butanol should be given to you in order to work the enthalpy change of vaporization of butanol if there is a rise in temperature, the reaction is exothermic and if there is a drop in temperature the reaction is endothermic. exothermic reactions have a negative enthalpy change, and therefore endothermic reactions have a positive enthalpy change. hope it helped (:
