What Energy Must Be Added or Given Off in a Reaction

question 85

Multiple Choice

What energy must be added or given off in a reaction where two hydrogen atoms and two neutrons are combined to form a helium atom? (Atomic masses for each: hydrogen,1.007 825 u;neutron,1.008 665 u;helium,4.002 602 u;also,1 u = 931.5 MeV/c²)

• A)74.85 MeV added
• B)74.85 MeV given off
• C)28.30 MeV given off
• D)28.30 MeV added

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Definitions:

Direct Materials

Direct materials are raw materials that are directly traceable to the manufacturing of a product and are a component of the total manufacturing cost.

Fixed Overhead Rate

A predetermined rate used to allocate fixed overhead costs to cost objects, calculated at the beginning of a period based on estimated costs and activity levels.

Fixed Factory Overhead Volume Variance

The difference between the budgeted and actual fixed overhead costs attributed to variations in production volume.

Gross Profit

The financial difference between revenue and the cost of goods sold before other expenses are deducted.