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mH2CO3 = 2 * mH + mC + 3 * mO
m = 2 * 1 u + 12 u + 3 *16 u
m = 2 u + 12 u + 48 u
m = 62 u
62 u - 100%
48 u - x
X = 48 *100% / 62
X ≈ 77,4%