Can someone explain why 56g of iron is 1 Mol? Watch

Azimbrook1
Badges: 10
Rep:
?
#1
Report Thread starter 3 weeks ago
#1
I know that a mole is a certain number of atoms.
but why is 1g of hydrogen = 1 mole or 2 grams of helium=1 mole.
0
reply
EierVonSatan
Badges: 21
#2
Report 3 weeks ago
#2
Simply, a mole is just a number of things in a similar way that:

2 = 1 pair
12 = 1 dozen
6.022x1023 = 1 mole

So

6.022x1023 of any atoms is 1 mole
0
reply
Sinnoh
Badges: 22
Rep:
?
#3
Report 3 weeks ago
#3
A mole is just the right number of something that you can tell the mass by the atomic or molecular number.

So if the atomic/molecular number of a thing is some number n, then a mole of it will weigh n grams.
Iron has a mass number of 56, so a mole of iron atoms will have a mass of 56g.

Works with molecules too. CO2 has a relative molecular mass of 44 (12 + 16 + 16) so a mole of CO2, or Avogadro's number of CO2 molecules, will have a mass of 44g.
Last edited by Sinnoh; 3 weeks ago
0
reply
epicnm
Badges: 14
Rep:
?
#4
Report 3 weeks ago
#4
A general chemistry rule is that the mass of 1 mole of any substance is the same as the atomic mass of that substance:
E.g
1mol Carbon is 12g
1 mol Oxygen is 16g
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Durham University
    Pre-Application Open Days Undergraduate
    Sat, 21 Sep '19
  • University of Exeter
    Undergraduate Open Day - Penryn Campus Undergraduate
    Sat, 21 Sep '19
  • Loughborough University
    Undergraduate Open Day Undergraduate
    Sat, 21 Sep '19

What's your favourite genre?

Rock (220)
23.63%
Pop (231)
24.81%
Jazz (35)
3.76%
Classical (56)
6.02%
Hip-Hop (174)
18.69%
Electronic (62)
6.66%
Indie (153)
16.43%

Watched Threads

View All