## Molar Mass

005388369
Posts: 73
Joined: Sat Sep 28, 2019 12:16 am

### Molar Mass

How does the molar mass change when you have an ion? Is it calculated the same as always?

Brian Tangsombatvisit 1C
Posts: 119
Joined: Sat Aug 17, 2019 12:15 am

### Re: Molar Mass

An ion is the same thing as the regular atom, but with a different charge. This means that the regular atom gains or loses a number of electrons, which doesn't really affect the atom's molar mass since electrons are so light. In short, ions have basically the same molar mass as the original atom.

Jared Khoo 1G
Posts: 107
Joined: Wed Sep 18, 2019 12:16 am

### Re: Molar Mass

Yes the calculation is the same as the difference is on the scale of 10-4 amu, the weight of an electron. Therefore the change in mass is not that much and is about the same.

MaryBanh_2K
Posts: 101
Joined: Wed Sep 18, 2019 12:21 am

### Re: Molar Mass

The molar mass does not change when you have an ion. For example, Fe and Fe3+ both have a molar mass of 55.845g/mol. The only difference between the atom (Fe) and ion (Fe3+) is that Fe3+ has 3 electrons. The molar mass remains the same because electrons do not have a large mass compared to the entire atom so their mass is disregarded in a way.

ClayMeunier1E
Posts: 5
Joined: Fri Aug 09, 2019 12:15 am

### Re: Molar Mass

An ion would simply have a different number of electrons. Since electrons do not have very much mass at all, an ion would not have a discernible different mass from any other ion of that element.

Tooba_1A
Posts: 11
Joined: Wed Sep 11, 2019 12:16 am

### Re: Molar Mass

Considering that an ion just has a different charge than a regular atom since it is gaining or losing electrons, this doesn't have much of an impact of the molar mass since the electron weighs nearly nothing to be having an effect on the molar mass.