Homework Help

How many atoms are in 2869.66 g Pt?

user profile pic

rif1191 | eNotes Newbie

Posted March 17, 2013 at 2:47 AM via web

dislike 1 like

How many atoms are in 2869.66 g Pt?

1 Answer | Add Yours

user profile pic

jerichorayel | College Teacher | (Level 1) Senior Educator

Posted March 17, 2013 at 4:17 AM (Answer #1)

dislike 1 like

To solve for this problem, the idea of the Avogadro’s number is necessary. Remember that 1 mole of any substance contains 6.022x10^23 atoms or particles or molecules or ions.

First we have to convert the given mass of Platinum (Pt) to the number of moles Pt. We can do that by using the molar mass of platinum.

`2869.66 grams Pt * (1 mol e Pt)/(195.084 grams)`

= 14.7099 moles Pt

Then, we convert the moles of Pt to the number of Pt atoms.

`14.7099 mol es Pt * (6.022x10^23 at oms Pt)/(1 mol e Pt)`

= 8.85828x10^24 atoms of Pt

Sources:

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes