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Masa C₂H₅OH: 2 * 12g + 5 * 1g + 16g + 1g = 46g <---- m[s]
Masa 9 H₂O: 9 * (2 * 1g + 16g) = 162g <--- m[w]
m[r] = 162g + 46g = 208g
208g ---- 100%
46g ---- x %
x = (46g * 100%) : 208g ≈ 22,12%