Question

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If 80% of an element has an atomic mass of 42.0u and 20.0% has an atomic mass of 43.0 u , What is the average atomic mass of the mixture?

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Answer 1

Answer:



Ernest Z. · Media Owl· Priya

Feb 13, 2014

The atomic masses of most elements are fractional because they exist as a mixture of isotopes of different masses.

Explanation:

Most elements occur as a mixture of isotopes of different masses. The fractional atomic masses arise because of this mixture.

Avg. mass = total mass of all atoms/number of atoms.

Before we calculate the average mass of atoms, let's use an analogy.

Assume that a class contains 10 boys (mass 60 kg) and 20 girls (mass 55 kg).

What is the average mass of the students.

Mass of boys = 600 kg

Mass of girls = 1100 kg

Total mass of students = 1700 kg

Avg. mass of 1 student=1700 kg30 students=56.7 kg/student

Answer 2

Answer:

Most elements occur as a mixture of isotopes of different masses. The fractional atomic masses arise because of this mixture. Avg. mass = total mass of all atoms/number of atoms.

Explanation:

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