Calculate energy, moles, and enthalpy change for reactions, heat transfer, and phase changes, including q = mcΔT and q = nΔH with unit conversions.
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Moles to kJ Formula
The following formula is used to calculate the energy in kJ for a given number of moles and enthalpy change.
Variables:
- E is the energy in kilojoules (kJ)
- n is the number of moles
- ΔH is the enthalpy change in kilojoules per mole (kJ/mol)
To calculate the energy, multiply the number of moles by the enthalpy change.
| Moles (mol) | Energy (kJ) | Energy (J) | Energy (cal) | Energy (BTU) |
|---|---|---|---|---|
| 0.001 | -0.286 | -286 | -68.315 | -0.271 |
| 0.005 | -1.429 | -1429 | -341.575 | -1.355 |
| 0.01 | -2.858 | -2858 | -683.150 | -2.709 |
| 0.02 | -5.717 | -5717 | -1366.300 | -5.418 |
| 0.025 | -7.146 | -7146 | -1707.875 | -6.773 |
| 0.05 | -14.292 | -14292 | -3415.750 | -13.546 |
| 0.075 | -21.437 | -21437 | -5123.626 | -20.319 |
| 0.1 | -28.583 | -28583 | -6831.501 | -27.091 |
| 0.2 | -57.166 | -57166 | -13663.002 | -54.183 |
| 0.25 | -71.458 | -71458 | -17078.752 | -67.729 |
| 0.5 | -142.915 | -142915 | -34157.505 | -135.457 |
| 0.75 | -214.373 | -214373 | -51236.257 | -203.186 |
| 1 | -285.830 | -285830 | -68315.010 | -270.915 |
| 1.5 | -428.745 | -428745 | -102472.514 | -406.372 |
| 2 | -571.660 | -571660 | -136630.019 | -541.829 |
| 2.5 | -714.575 | -714575 | -170787.524 | -677.286 |
| 3 | -857.490 | -857490 | -204945.029 | -812.744 |
| 4 | -1143.320 | -1143320 | -273260.038 | -1083.658 |
| 5 | -1429.150 | -1429150 | -341575.048 | -1354.573 |
| 10 | -2858.300 | -2858300 | -683150.096 | -2709.146 |
| Assumes enthalpy change ΔH = -285.83 kJ/mol (formation of liquid water at 25°C). Negative sign indicates heat released (exothermic). Energy conversions used: 1 kJ = 1000 J ≈ 239.005736 thermochemical cal ≈ 0.947817120 BTU (International Table). | ||||
What is Moles to kJ?
The moles to kJ calculation is used to determine the amount of energy in kilojoules (kJ) for a given number of moles and enthalpy change. This is particularly useful in chemistry when dealing with reactions and energy changes. The enthalpy change (ΔH) represents the heat absorbed or released during a reaction per mole of substance.
How to Calculate Moles to kJ?
The following steps outline how to calculate the energy in kilojoules from moles and enthalpy change.
- First, determine the number of moles (n).
- Next, determine the enthalpy change (ΔH) in kJ/mol.
- Finally, calculate the energy using the formula E = n * ΔH.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Number of moles (n) = 2
Enthalpy change (ΔH) = 50 kJ/mol
