Using balanced equations to work out reacting masses
eg Hydrogen + Chlorine --> Hydrochloric acid
H2 + Cl2 --> 2HCl
Ar/Mr 2 71 36.5
mol 1 1 2
mass 2 71 73
eg sodium hydroxide + chlorine --> bleach + salt + water
2NAoH + Cl2 ---> NaOCl + NaCl + H2O
Ar/Mr 40 71
mass 100g 88.75g
mol 2.5 1.25
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