KCET2016ChemistrySome Basic Concepts of Chemistry
The number of oxygen atoms in ( 4.4 gm ) of ( CO ₂ ) is,
Options
- A( 1.2 10²³ )
- B( 6 10²² )
- C( 6 10²³ )
- D( 12 10²³ )
Correct answer
A. ( 1.2 10²³ )
Step-by-step solution
( 1 ) molecule of ( CO ₂ ) contains ( 2 ) oxygen atoms Therefore, ( 1 ) mole of ( CO ₂ ) contains ( 6.022 10²³ 2 ) oxygen atoms. ( 44 g ) of ( C O₂=6.022 10²³ 2 ) oxygen atoms ( 4.4 g ) of ( C O₂= 6.022 10²³ 2 4.4 44 =12.044 10²² ) oxygenatoms. Hence ( 4.4 ~g ) of ( CO ₂ ) will contain ( 1.2044 10²³ ) oxygen atoms.