The Combustion of Ammonia in the Presence of Excess Oxygen

question 37

Multiple Choice

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7 O₂ (g) → 4 NO₂ (g) + 6 H₂O (g)
The combustion of 43.9 g of ammonia produces ________ g of NO₂.

• A)2.58
• B)178
• C)119
• D)0.954
• E)43.9

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Definitions:

Predetermined Overhead Rate

A rate used to allocate overhead costs to products or services, calculated in advance based on estimated overhead costs and an allocation base.

Machine-Hours

Machine-hours are a measure of the amount of time a machine is operated, used in allocating manufacturing overhead based on usage.

Direct Labor-Hours

The number of labor hours spent by employees directly working on the production of goods or services.

Casting

A manufacturing process where a liquid material is poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify.