Question

the mass of oxygen atom is 16.00u find its mass in kg

Answer 1

Answer :

$\underline{Things \: you \: need \: to \: know \: before \: answering \: this \: question-- } \\ \\[\tex] \textbf{What is atomic mass unit or u or amu ?}$
=> Atomic mass unit is defined as 1/12th the mass of carbon atom C-12

$\textbf{What is C-12?}$
=> It is an isotope of carbon.

$\bold{1 \: amu \: or \: 1 u \: = \: 1.6605 \: × \: 10^-24 \:g}$
= 1.6605 × 10^-27 kg

$\textbf{Main solution :}$

$\bold{Given,}$

Mass of oxygen atom = 16u

$\textbf{To find,}$

Mass of oxygen atom in kg

1u = 1.6605 × 10^-27

Therefore,

16u = 16 × 1.6605 × 10^-27 kg

= 26.568 × 10^-27 kg

$\textbf{ =2.6568 × 10^-26 kg . Answer}$

Answer 2

GIVEN :

mass of an oxygen atom = 16. a.m.u

TO FIND :

mass of an oxygen atom in grams

FORMULA USED :

1 a.m.u = 1.66054 x 10^-24 grams

SOLUTION :

=> 1 a.m.u = 1.66054 x 10^-24 grams

=> 16 amu = 16× 1.66054 x 10^-24

=> 16 amu = 26.56864 x 10^-24 grams

ANSWER :

26.56864 x 10^-24 grams