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C[n]H[2n+1]COOH + KOH ----> C[n]H[2n+1]COOK + H₂O
masa KOH: 39 + 1 + 16 = 56g
1,15g ----- 1,4g
x g ----- 56g
x = (1,15g * 56g) : 1,4g = 46g <---- masa szukanego kwasu
masa C: 12g
masa H: 1g
masa O: 16g
C[n]H[2n+1]COOH
12g * n + 1g * (2n + 1) + 12g + 2 * 16g + 1g = 46g
12n + 2n + 1 + 12 + 32 + 1 = 46
14n + 46 = 46
n = 0
H: 2n + 1 = 2 * 0 + 1 = 1
wzór kwasu: HCOOH (kwas mrówkowy)