# Lösung: Modul schreiben

<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
module Chemie
  N_a = 6.02214179E23
  M_v = 22.413996

  def Chemie.volume_o2(m_O)
    m_O / 32 * M_v
  end
end

puts Chemie::N_a
puts Chemie::volume_o2(10.0)
```