Question

When one mole of hydrogen, H2, is formed, 131 kJ of energy is absorbed.

Calculate the amount of energy absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure, is formed

Answer 1

to find:

the amount of energy absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure, is formed.

solution:

According to Avogadro's law 1 mole of any gas occupies 22.4 L (dm3) at room temperature and pressure.

So the amount of energy absorbed:

(kJ)E=131∗240/22.4

=1403.6(kJ)

1403.6 kJ is absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure is formed.