T/F: The mass of an atom is so small it is rounded to 0 amu?
- Dr WLv 71 month ago
some things you need to know..
.. (1) 1 amu = 1/6.022x10^23 grams = 1.66x10^-24 grams
.. (2) the mass of 1 proton ~ 1 amu
.. (3) all atoms have at least 1 proton
.. all atoms have mass ≿ 1 amu
.. the mass of an atom is never rounded to 0 amu.
- ZirpLv 71 month ago
The mass of the smallest atom is rounded to ONE amu
- ChemTeamLv 71 month ago
This is a false statement.
amu is not the same as mass. mass is measured in grams while amu is the unit for a concept called 'relative atomic mass.
The basic definition is this: the carbon-12 isotope (6 proton & 6 neutron) is _defined_ as weighing exactly 12 amu.
If you are some other element and your nucleus weighs exactly twice what C-12 weighs, then you weigh 24 amu.
The selection of C-12 as the standard for amu occurred in 1957, I think.
You can determine the mass of 1 amu and I do not have it memorized. In all my years of classroom teaching, I never bothered with what 1 amu weighed in grams. There are problems that do use that relationship, I never bothered with them.
By the way, the standard for g (more exactly, kg) is a cylinder of 90% platinum and 10% iridium, I think. It is defined was weighing 1000 g. There is only one primary standard (kept in Paris) and it has been brought out 4 times since 1900 to help calibrate some secondary standards.
- UserLv 71 month ago
...of an atom of what?
Hydrogen - lightest atom - average mass of one atom = 1.008 AMU
Uranium - heaviest stable naturally-occuring atom - average mass of one atom = 238.03 AMU
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- Roger the MoleLv 71 month ago