What volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at constant temperature and pressure? The equation for reaction is 2NH3(g) → N2(g) + 3H2(g)

  • A 50cm3
  • B 150cm3
  • C 200cm3
  • D 300cm3
waec 2002chemistry

The correct answer is B. 150cm3

According to the equation 2NH3 → N3 + 3H2

2 x 22400cm3 of ammonia will produce

3 x 22400cm3 of hydrogen

If 100cm3 of NH3 is used.

:. H2 volume = \(\frac{100}{2x22400} x 3x22400

=150cm3

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