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Click symbol for equation molar mass constant  Numerical value  0.999 999 999 65 x 10-3 kg mol-1  Standard uncertainty  0.000 000 000 30 x 10-3 kg mol-1   Relative standard uncertainty  3.0 x 10-10  Concise form  0.999 999 999 65(30) x 10-3 kg mol-1       Click here for correlation coefficient of this constant with other constants Source: 2018 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant