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QUESTION

Question 110 pts

What is the atomic mass of Hafnium if 5% have a mass of 175.967 g/mol, 19% have a mass 177.046 g/mol, 27% have a mass of 178.012 g/mol, 14% have a mass of 178.968 g/mol, and 35% have a mass of 180.037 g/mol?  Submit your answer with three decimal places.

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Question 210 pts

Magnesium has three naturally occurring isotopes. 78.70% of Magnesium atoms exist as Magnesium-24 (24.015 g/mol), 10.03% exist as Magnesium-25 (24.955 g/mol) and 11.17% exist as Magnesium-26 (25.968 g/mol). What is the average atomic mass of Magnesium. Submit your answer with three decimal places.

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Question 310 pts

Determine the atomic mass for Iron-57 based on the following data:

The average atomic mass for Iron in this problem is 55.890 amu.

IsotopeAtomic MassPercent Abundance

Iron-5453.9555.845

Iron-5656.00791.754

Iron-57X2.401

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Question 410 pts

Bromine has two naturally occurring isotopes. Bromine-79 has a mass of 78.918 amu and is 50.69% abundant. Using the average atomic mass of 79.923, determine the mass of bromine-81 if it is 49.31% abundant.

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Question 510 pts

Bromine has two naturally occurring isotopes. Bromine-79 has a mass of 78.918 amu and is 50.69% abundant. Using the average atomic mass of 79.859, determine the mass of bromine-81 if it is 49.31% abundant.

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Question 610 pts

Determine the atomic mass for Iron-57 based on the following data:

The average atomic mass for Iron in this problem is 55.890 amu.

IsotopeAtomic MassPercent Abundance

Iron-5453.9895.845

Iron-5655.96591.754

Iron-57X2.401

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Question 710 pts

Boron has an average atomic mass of 10.81 amu.  Based on the data below determine the most abundant isotope.

IsotopeMass

Boron-1010.013

Boron-1111.009

Boron-11

Cannot determine based on the information given

Boron-10

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Question 810 pts

If Uranium has an average atomic mass of 237.985 amu which of the isotopes below is the most abundant?

IsotopeMass

Uranium-234234.088

Uranium-235234.977

Uranium-238238.007

Uranium-235

Uranium-234

Cannot determine based on the information given

Uranium-238

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Question 910 pts

Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common isotopes. Using the chart below determine the average atomic mass of Uranium.  Submit your answer with three decimal places.

IsotopeMassPercent Abundance

Uranium-234233.9310.01

Uranium-235234.9940.71

Uranium-238238.06399.28

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Question 1010 pts

Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb with masses of 84.967 and 87.040 respectively. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of Rubidium?  Submit your answer with three decimal places.