M HCOOH = 46 g/mol
M CH₃OH = 32 g/mol
m HCOOH = 2,3 g
H⁺
HCOOH + CH₃OH ⇄ HCOOCH₃ + H₂O
46 g HCOOH reaguje z 32 g CH₃OH
2,3 g HCOOH ------------- g CH₃OH