Molar Mass

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Molar Mass

Postby 005388369 » Wed Oct 02, 2019 3:05 pm

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

Brian Tangsombatvisit 1C
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Re: Molar Mass

Postby Brian Tangsombatvisit 1C » Wed Oct 02, 2019 3:11 pm

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
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Re: Molar Mass

Postby Jared Khoo 1G » Wed Oct 02, 2019 4:24 pm

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.

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Re: Molar Mass

Postby MaryBanh_2K » Thu Oct 03, 2019 10:20 pm

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.

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Re: Molar Mass

Postby ClayMeunier1E » Thu Oct 03, 2019 10:27 pm

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.

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Re: Molar Mass

Postby Tooba_1A » Fri Oct 04, 2019 12:10 am

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.

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