The Average Atomic Weight of Copper,which Has Two Naturally Occurring

question 175

Multiple Choice

The average atomic weight of copper,which has two naturally occurring isotopes,is 63.5.One of the isotopes has an atomic weight of 62.9 amu and constitutes 69.1% of the copper isotopes.The other isotope has an abundance of 30.9%.The atomic weight (amu) of the second isotope is ________ amu.

• A)63.2
• B)63.8
• C)64.1
• D)64.8
• E)28.1

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Definitions:

Degrees of Freedom

The number of independent values or quantities which can be assigned to a statistical distribution without violating given constraints.

Regression Model

A mathematical representation of the relationship between a dependent variable and one or more independent variables.

Independent Variable

A variable that is manipulated or categorized to observe its effect on a dependent variable, without being affected by other variables in the experiment.

Error Variable

It represents the difference between observed and theoretical values in statistical models, attributable to randomness or unforeseen factors.