$ irb
irb(main):001:0> require 'eulim'
irb(main):002:0> Eulim::Chemistry::Reaction.new(equation: 'KMnO4 + HCl >> KCl + MnCl2 + H2O + Cl2').balanced_eqn
 => "2KMnO4 + 16HCl >> 2KCl + 2MnCl2 + 8H2O + 5Cl2"
 
irb(main):003:0> Eulim::Chemistry::Compound.new("CaCO3")
=> #<Eulim::Chemistry::Compound:0x00000002a65340 @formula="CaCO3", @constituents={"Ca"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c805a8 @name="Calcium", @symbol="Ca", @atomic_number=20, @atomic_mass=#<Unitwise::Measurement value=40.078 unit=u>>, :atom_count=>1}, "C"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c8f6e8 @name="Carbon", @symbol="C", @atomic_number=6, @atomic_mass=#<Unitwise::Measurement value=12.0107 unit=u>>, :atom_count=>1}, "O"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c8dc30 @name="Oxygen", @symbol="O", @atomic_number=8, @atomic_mass=#<Unitwise::Measurement value=15.9996 unit=u>>, :atom_count=>3}}, @molecular_mass=#<Unitwise::Measurement value=100.0875 unit=u>>

irb(main):004:0> Eulim::Chemistry::Reaction.new(equation: '2Na(s) + 2HCl(aq) >> 2NaCl(aq) + H2(g)')
=> #<Eulim::Chemistry::Reaction:0x00000002ce22f8 @equation="2Na(s) + 2HCl(aq) >> 2NaCl(aq) + H2(g)", @species={:reactants=>{"Na"=>{:compound=>#<Eulim::Chemistry::Compound:0x00000002ce1d80 @formula="Na", @constituents={"Na"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c88e10 @name="Sodium", @symbol="Na", @atomic_number=11, @atomic_mass=#<Unitwise::Measurement value=22.9897 unit=u>>, :atom_count=>1}}, @molecular_mass=#<Unitwise::Measurement value=22.9897 unit=u>>, :stoichiometry=>2, :state=>"solid"}, "HCl"=>{:compound=>#<Eulim::Chemistry::Compound:0x00000002cabdc0 @formula="HCl", @constituents={"H"=>{:element=>#<Eulim::Chemistry::Element:0x000000025e5ab8 @name="Hydrogen", @symbol="H", @atomic_number=1, @atomic_mass=#<Unitwise::Measurement value=1.0079 unit=u>>, :atom_count=>1}, "Cl"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c82c90 @name="Chlorine", @symbol="Cl", @atomic_number=17, @atomic_mass=#<Unitwise::Measurement value=35.453 unit=u>>, :atom_count=>1}}, @molecular_mass=#<Unitwise::Measurement value=36.4609 unit=u>>, :stoichiometry=>2, :state=>"aqueous"}}, :products=>{"NaCl"=>{:compound=>#<Eulim::Chemistry::Compound:0x00000002c8cda8 @formula="NaCl", @constituents={"Na"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c88e10 @name="Sodium", @symbol="Na", @atomic_number=11, @atomic_mass=#<Unitwise::Measurement value=22.9897 unit=u>>, :atom_count=>1}, "Cl"=>{:element=>#<Eulim::Chemistry::Element:0x00000002c82c90 @name="Chlorine", @symbol="Cl", @atomic_number=17, @atomic_mass=#<Unitwise::Measurement value=35.453 unit=u>>, :atom_count=>1}}, @molecular_mass=#<Unitwise::Measurement value=58.4427 unit=u>>, :stoichiometry=>2, :state=>"aqueous"},"H2"=>{:compound=>#<Eulim::Chemistry::Compound:0x00000002c6f938 @formula="H2", @constituents={"H"=>{:element=>#<Eulim::Chemistry::Element:0x000000025e5ab8 @name="Hydrogen", @symbol="H", @atomic_number=1, @atomic_mass=#<Unitwise::Measurement value=1.0079 unit=u>>, :atom_count=>2}}, @molecular_mass=#<Unitwise::Measurement value=2.0158 unit=u>>, :stoichiometry=>1, :state=>"gaseous"}}}, @is_valid=true, @is_balanced=true>