# 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??

##### 1 Answer

Write your answer here...

Start with a one sentence answer

Then teach the underlying concepts

Don't copy without citing sources

preview

?

#### Answer

Write a one sentence answer...

#### Answer:

#### Explanation

Explain in detail...

#### Explanation:

I want someone to double check my answer

Junaid Mirza
Share

Feb 9, 2018

Mass of carbon-12 is not

#"1u" = 1.66 × 10^-27 "kg"#

#"1u" = 1/12 × "Mass of carbon-12"#

Mass of

#= 12 × 1.66 × 10^-27 "kg"#

#= 1.992 × 10^-26 "kg"#

Was this helpful? Let the contributor know!

Describe your changes (optional) 200