Copper Occurs in an Isotopic Mixture of 69

question 38

Multiple Choice

Copper occurs in an isotopic mixture of 69.09% 63Cu (mass = 62.93 u per atom) and 30.91% 65Cu (mass = 64.93 u per atom) . What is the average atomic mass of copper?

• A) 64.00 u
• B) 63.55 u
• C) 63.45 u
• D) 64.31 u
• E) 29.00 u

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Definitions:

Capital Expenditure

Resources allocated by a corporation to purchase or improve tangible assets like land, factories, or machinery.

Variable Costs

Costs that vary directly with the level of production or sales volume, such as raw materials and direct labor costs.

Contribution Margin

The amount by which sales revenue exceeds variable costs of production, indicating how much contributes to fixed costs and profits.

Marginal Cost

The cost incurred by producing one additional unit of a product or service, important for pricing and production decision-making.