The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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helion molar mass
 $M({\rm h}),M_{\rm h}$
 Numerical value  3.014 932 246 13 x 10-3 kg mol-1
 Standard uncertainty  0.000 000 000 91 x 10-3 kg mol-1
  Relative standard uncertainty  3.0 x 10-10
 Concise form  3.014 932 246 13(91) 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

 
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