Element X Has Three Naturally Occurring Isotopes

question 33

Multiple Choice

Element X has three naturally occurring isotopes.The masses (amu) and % abundances of the isotopes are given in the table below.The average atomic mass of the element is ________ amu.

• A)41.54
• B)39.68
• C)39.07
• D)38.64
• E)33.33

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Definitions:

Profit-Maximizing Rule

A principle that states a firm reaches its highest profit when its marginal cost equals its marginal revenue.

Marginal Revenue

The revenue increase from the sale of one more unit of a product or service.

Marginal Cost

is the increase in total cost that arises from producing one additional unit of a product or service.

Total Fixed Cost

The total fixed cost refers to the sum of all costs that do not change with the level of output produced by a company or during a specific period.