When you multiply a reaction by a factor, you also multiply the enthalpy change (ΔH) of that reaction by the same factor. Therefore, if you multiply the reaction by 2, you would take the original enthalpy of reaction and multiply it by 2. For example, if the original ΔH is -100 kJ, the final value for the enthalpy of reaction you would use would be -200 kJ.
If you multiply a reaction by 2 in a Hess's law problem, you also need to multiply the enthalpy change (( \Delta H )) of that reaction by 2. For example, if the original enthalpy of reaction is ( \Delta H ), the enthalpy for the intermediate reaction will be ( 2 \Delta H ). This ensures that the thermodynamic properties remain consistent with the stoichiometry of the modified reaction.
What you need is the enthalpy of fusion for ice and simply multiply it by your mass. An online search shows that the enthalpy of fusion for ice is: 79.72 cal/g So calories needed to melt all your ice is just. Energy = 79.72cal/g x 25g = 242.50 calories
To determine the final entropy change for a reaction when multiplied by a choice, you would typically apply the principle of additivity of entropy. If you multiply a reaction by a factor, the change in entropy for the overall reaction will also be multiplied by that same factor. Therefore, if you have the standard entropy change for the original reaction, you would multiply that value by the factor you used to scale the reaction to find the final entropy change for the intermediate.
The specific enthalpy of vaporization (usually represented by the letter H with a carat above it) is generally given as units of energy per unit mass or per mole. If given in terms of per unit mass, the mass boiled can be calculated by dividing the energy input by the specific enthalpy. If given in terms of per mole, first divide the energy by the specific enthalpy then multiply the result by the mass per mole.
When you multiply a reaction by a factor, you also multiply the enthalpy change (ΔH) of that reaction by the same factor. Therefore, if you multiply the reaction by 2, you would take the original enthalpy of reaction and multiply it by 2. For example, if the original ΔH is -100 kJ, the final value for the enthalpy of reaction you would use would be -200 kJ.
When you multiply a reaction by a factor, you also multiply the enthalpy change by the same factor. Therefore, if you multiply the reaction by 2, the final value for the enthalpy of reaction for the intermediate reaction will also be multiplied by 2.
If you need to multiply the reaction by 2, you must also multiply the enthalpy change by 2. The final value for the enthalpy of the reaction used for the intermediate reaction would be 2 times the original enthalpy value.
If you multiply a reaction by 2 in a Hess's law problem, you also need to multiply the enthalpy change (( \Delta H )) of that reaction by 2. For example, if the original enthalpy of reaction is ( \Delta H ), the enthalpy for the intermediate reaction will be ( 2 \Delta H ). This ensures that the thermodynamic properties remain consistent with the stoichiometry of the modified reaction.
-572k
2820 kJ
The final value for the enthalpy of reaction would be double the original value. This is because when a reaction is reversed, the sign of the enthalpy value changes (positive becomes negative and vice versa). Multiplying by 2 simply scales this new value.
Enthalpy is the energy absorbed or lost from a reaction, but enthalpy change per mole is the amount of energy lost per mole, so in order to get the overall enthalpy from the change per mole, you must multiply that value by the amount of moles used in the reaction.
What you need is the enthalpy of fusion for ice and simply multiply it by your mass. An online search shows that the enthalpy of fusion for ice is: 79.72 cal/g So calories needed to melt all your ice is just. Energy = 79.72cal/g x 25g = 242.50 calories
To determine the final entropy change for a reaction when multiplied by a choice, you would typically apply the principle of additivity of entropy. If you multiply a reaction by a factor, the change in entropy for the overall reaction will also be multiplied by that same factor. Therefore, if you have the standard entropy change for the original reaction, you would multiply that value by the factor you used to scale the reaction to find the final entropy change for the intermediate.
You multiply by 1000.
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