Frequent question: How many kilojoules are in a mole?

How do you convert kJ to moles?

The prefix “kilo” means 1,000, so one kJ = 1,000 J. As the energies associated with a single molecule or atom are quite small, we often find it easier to discuss the energy found in one mole of the substance, hence “per mole”. To get the energy for one molecule, divide kJ/mol by Avogadro’s number, 6.022 x 1023.

How do you calculate energy in kilojoules per mole?

The conversion to kJ/mol involves using Avogadro’s number and converting J to kJ: E (kJ/mol) = (3.713 × 1019 J/photon)(6.022 × 1023 photon/mol)(103kJ/J) = 224 kJ/mol.

How do you convert J mol to kJ?


  1. J/mol = 0.001 kj/mol.
  2. J/mol = 0.002 kj/mol.
  3. J/mol = 0.003 kj/mol.
  4. J/mol = 0.004 kj/mol.
  5. J/mol = 0.005 kj/mol.
  6. J/mol = 0.006 kj/mol.
  7. J/mol = 0.007 kj/mol.
  8. J/mol = 0.008 kj/mol.

How many calories are in a kJ mol?

To get the energy for one molecule, divide kJ/mol by Avogadro’s number, 6.022 x 1023. A calorie was originally defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius. One calorie = 4.184 J. One kcal = 1,000 cal.

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How many moles are in a Joule?

Since 1 mole = 6.02214076×1023 particles (atoms, molecules, ions etc.), 1 joule per mole is equal to 1 joule divided by 6.02214076×1023 particles, 1.66054×1024 joule per particle.

Is kJ and kJ mol the same?

Usually it seems that delta H for an entire reaction is in kJ, since there are varying numbers of moles depending on which product or reactant it is. If the question asks for kJ per mole of product, then you would have to divide the enthalpy by the specific number of moles and give the answer in kJ/mole.

How many joules is in a Kilojoule?

Kilojoules to joules conversion table

Energy (kJ) Energy (J)
1 kJ 1000 J
2 kJ 2000 J
3 kJ 3000 J
4 kJ 4000 J

How do you find kJ in chemistry?

In this case, the final solute molecule or ion is dissolving into a solution with a mass approximated by the mass of the solvent plus the mass of the solute. You can convert energy in joules (J) to kilojoules (kJ) by dividing the number of joules by 1000.

Is kJ the same as J?

Joules and KiloJoules are units of the international system of units (SI) that measure energy. The standard symbol for Joule is J, whereas the symbol for KiloJoule is KJ. 1 J equals precisely 0.001 KJ, therefore there are 1,000 Joules in a KiloJoule.

How do you convert joules to Kelvin?

Divide the amount of heat energy provided to the substance, in joules, by the mass of the substance, in grams (g). For example, if 4,000 joules of energy were provided to 500 g of water, you would calculate 4,000/500 = 8. Divide the result of the previous calculation by the specific heat capacity of the substance.

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