It is expressed as a multiple of one-twelfth the mass of the carbon -12 atom, 1.992646547 × 10 −23 gram, which is assigned an atomic mass of 12 units. In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10 −24 gram. Read More on This Topic atom: Atomic mass and isotopes
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Favorite Answer it is 12. amu is defined as 1/12 the weight of a carbon atom. this is because carbon has 12 protons, so its supposed to roughly be the weight of a single atom. This is not strictly...
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substance, 12 C, the molar mass of any substance is numerically equialenvt to its atomic or formula weight in amu. Per the amu de nition, a single 12 C atom weighs 12 amu (its atomic mass is 12 amu). According to the de nition of the mole, 12 g of 12 C contains 1 mole of 12 C atoms (its molar mass is 12 g/mol). This relationship
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The mass spectrometer reports that there are two isotopes of carbon, 98.99% of the sample has a mass of 12 amu (not a surprise since this is the atom on which the scale is based). 1.11% of the sample has a mass of 13.003355 amu (this isotope is 1.0836129 times as massive as 12 C) The average mass is simply a weighted average.
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Carbon = 12.011. (% abundance x mass number of isotope 1) + (% abundance x mass number of isotope 2) + (% abundance x mass number of isotope 3) + etc. = average atomic mass for the element. DO NOT DIVIDE BY ANYTHING! This is not a regular average.
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Jan 12, 2011 · A compound with a formula mass of 42.08 amu is found to be 85.64% carbon and 14.36 % hydrogen by mass. find its molecular formula. Nick C Jan 12, 2011