Homework Help

How many molecules are present in 16 g of oxygen gas, O2(g)?[Avogadro constant = 6 ×...

user profile pic

roshan-rox | (Level 1) Valedictorian

Posted May 15, 2013 at 3:37 PM via web

dislike 1 like

How many molecules are present in 16 g of oxygen gas, O2(g)?
[Avogadro constant = 6 × 10^23 mol^−1]
A)  96 × 10^23

B ) 12 × 10^23

C ) 6 × 10^23

D)  3 × 10^23

1 Answer | Add Yours

Top Answer

user profile pic

jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted May 15, 2013 at 4:24 PM (Answer #1)

dislike 1 like

Molar mass of O = 16g/(mol)

Mass of O = 16g

Amount of O moles = 16/16 = 1mol

 

By Avogadro law 1mol of a substance contain `6 xx 10^23` of molecules.

So 1mol of O will contain `6 xx 10^23` molecules.

 

So the answer is `6xx10^23` molecules. Correct answer is C.

 

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes