Assertion: kilogram's mass | /r/HasProperty | 40.078±0.004 grams
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Source sentences:
text: For example, the mass of one mole of calcium-40 is 39.96259098±0.00000022 grams, whereas the mass of one mole of calcium-42 is 41.95861801±0.00000027 grams, and of one mole of calcium with the normal isotopic mix is 40.078±0.004 grams.