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Molar Mass

Posted: Wed Oct 02, 2019 3:05 pm
by 005388369
How does the molar mass change when you have an ion? Is it calculated the same as always?

Re: Molar Mass

Posted: Wed Oct 02, 2019 3:11 pm
by Brian Tangsombatvisit 1C
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.

Re: Molar Mass

Posted: Wed Oct 02, 2019 4:24 pm
by Jared Khoo 1G
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.

Re: Molar Mass

Posted: Thu Oct 03, 2019 10:20 pm
by MaryBanh_2K
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.

Re: Molar Mass

Posted: Thu Oct 03, 2019 10:27 pm
by ClayMeunier1E
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.

Re: Molar Mass

Posted: Fri Oct 04, 2019 12:10 am
by Tooba_1A
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.