## kaylala 2 years ago How many grams is 1 a.m.u. ? (please provide or show a Detailed SOLutioN) Thanks!

1. thomaster

An atomic mass unit is equal to 1.66053892 × 10^-27 kilograms

2. shkrina

http://answers.yahoo.com/question/index?qid=20090107072739AA1Pe1D hope it helps ...

3. kaylala

@thomaster so, how do you compute for the grams?

4. thomaster

What do you mean? what 1 amu is in gram? That's \(\large\sf 1.66053892 × 10^{-24}\) gram

5. kaylala

@thomaster what is 1 amu in gram? --- this is what i meant now, how did you get 1.66 x 10^-24 gram? i need the solution too. if you may

6. thomaster

It is just a constant, you can't calculate it. A long time ago they decided to take the mass of carbon-12 and divide that by 12 to get 1 amu.

7. kaylala

@thomaster but how come my book has a derivation / solution of how to know how much is 1g in amu? see the attached picture below:

8. kaylala

HERE IS THE SOL'n

9. thomaster

that's the relationship between the amu mass and avogadro's number Avogadro's number is the amount of particles in 1 mole of a compound. Like it says in your book, 1 gram is avogadro's number in amu You could solve this with a crosstable |dw:1372679331655:dw|

10. kaylala

ok. i got it thanks @thomaster

11. thomaster

No problem :)

12. kaylala

@thomaster wait a minute. i'm mixed up how's you get 1.66x10^-24? when we're supposed to find how many grams is in 1 amu?

13. kaylala

@thomaster if the answer is 1.66x10^-24; then how did you get 1.66x10^-24 as your solution variable?

14. thomaster

1 divided by avogadro's number = 1.66*10^-24

15. thomaster

because 6.022*10^23 amu = 1 gram

16. kaylala

@thomaster where did 1 come from?

17. kaylala

what's the precise formula?

18. kaylala

what's the precise formula? and the summary of all? @thomaster

19. thomaster

It's explained here: |dw:1372682633203:dw|

20. thomaster

since 1*1 = 1 that's where the 1 comes from

21. kaylala

ok thanks again for clarifying :))))))