Reaction enthalpy, mass difference 1 (thermo-30) In the blast gas reaction 2H + O → H2O, the reaction energy of 571.6 kJ/mol is released. Note: [J] = [kg m2 s-2]

  Exercise: thermo-30    

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In the blast gas reaction 2H + O → H₂O, the reaction energy of 571.6 kJ/mol is released.
Note: [J] = [kg m² s^-2]

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Solution:

1. According to Einstein holds E=m·c² or ΔE=Δm·c²
2. c is the speed of light, 300'000 km/s
3. Transform the Einstein equation according to m or Δm
4. Δm = ΔE/c²
5. Δm = 571.6·1000[kg·m²/s²]/(300'000'000 m/s)² = 6.35·10^-12 kg

The calculated 6.35·10^-12 kg refers to a Mol. Now, if you want to turn back to a single water molecule, you have to divide it by Avogadro's number (6.022·10²³) and you get the theoretical mass reduction per molecule:
6.35·10^-12 kg / 6.022·10²³ = 1.05·10^-35 kg

ABER: according to 'good question.[translation unavailable]', this time but a useful answer:
The increase at mass through is not through simple supply of energy, but through the DIREKTE conversion of energy to subject matter (the energy KONDENSIERT QUASI ZU MATERIE) this occurring however, at so high temperatures, that the classical physics not more holds. With a pure supply of energy, there is only an increase in temperature.

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