Percent Abundance

Front

Isotopes of an element have a different number of...

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Neutrons

Front

Rubidium has two common isotopes, ⁸⁵Rb and ⁸⁷Rb. If the abundance of ⁸⁵Rb is 72.2% and the abundance of ⁸⁷Rb is 27.8%, what is the average atomic mass of rubidium?

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85.6 amu

Front

There are two primary isotopes found in any sample of copper: copper-63 and copper-65. The isotope ⁶⁵Cu composes 69.2% of the sample and ⁶³Cu comprises the other 30.8%. Based on this data, what is the atomic mass of copper?

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64.4 amu

Front

An isotope has three forms: 30% have a mass of 4 amu, 20% have a mass of 5 amu, and 50% have a mass of 3 amu. What is the average atomic mass?

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4 amu

Front

Calculate the average atomic mass of silver.

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107.8677amu

Front

An element has two naturally occurring isotopes: 10.013 amu (19.9% abundant) and 11.01 amu (80.1% abundant). What is the average atomic mass? What element is it?

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10.812, Boron

Front

Average atomic mass of atom X given: 4.35% have 39.946 amu, 83.79% have 41.941 amu, 9.50% have 42.941 amu, 2.36% have 43.939 amu.

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41.97 amu

Front

An isotope has three forms. 30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu. Average atomic mass will be closest to? Options: 2 amu, 3 amu, 4 amu, 5 amu

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4 amu

Front

Atom 1: Mass=12, Protons=6; Atom 2: Mass=14, Electrons=6. Are these atoms isotopes of each other or different elements?

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Isotopes of Carbon

Front

Nitrogen has three occurring isotopes: Nitrogen-13, Nitrogen-14, Nitrogen-15. Which isotope is the most abundant?

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Nitrogen-14