According to Avogadro's law 1 mole of any gas occupies 22.4 L (dm3) at room temperature and pressure.
So find the amount of energy absorbed:
"E = 131 * 240\/22.4 = 1403.6 (kJ)"
Answer: 1403.6 kJ is absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure is formed.
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