Naturally occurring europium (Eu) consists of two isotopes with a mass of 151 and 153. 151/63 Eu has an abundance of 48.03% and 153/63 Eu has an abundance of 51.97%. What is the atomic mass of europium?
The atomic mass of europium is 152 u.
Method 1
Assume that you have 10 000 atoms of Eu.
Then you have 4803 atoms of
Mass of
Mass of
Mass of 10 000 atoms = 1 520 394 u
Average mass =
Method 2
Total = "152.0394 u" = 152 u
Note: In both methods, the answer can have only three significant figures, because that is all you gave for masses of the two isotopes.
Hope this helps.
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The weighted average of the masses of europium's isotopes multiplied by their respective abundances yields the atomic mass of the element: atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2)... atomic mass = (151 * 0.4803) + (153 * 0.5197)... atomic mass ≈ (72.6153) + (79.7031)......... \
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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