Most text books say: 1u is exactly one twelveth of mass of carbon12 ,they give its value=1.66x10^-27, but this is the mass of carbon12, 1u is one twelveth of mass of carbon12.it should be: mass of carbon divided by 12??

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Feb 9, 2018

Mass of carbon-12 is not #1.66 × 10^-27 "kg"#. It’s twelve times of it.

#"1u" = 1.66 × 10^-27 "kg"#

#"1u" = 1/12 × "Mass of carbon-12"#

Mass of#color(white)(.) ""^12"C" = 12 × "1u" #

#= 12 × 1.66 × 10^-27 "kg"#

#= 1.992 × 10^-26 "kg"#

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