How Much Heat (KJ) Is Evolved When 4 $\rarr$ 2 Fe(s) + 3 CO₂(g)

question 112

Multiple Choice

How much heat (kJ) is evolved when 4.50 g of Fe₂O₃ is reacted with excess carbon monoxide using the equation below?
Fe₂O₃(s) + 3CO(g) $\rarr$ 2 Fe(s) + 3 CO₂(g) $\Delta$ H ^$\circ$ _rxn = - 24.8 kJ/mol,

• A) 0.699 kJ
• B) 2.10 kJ
• C) 17.9 kJ
• D) 24.8 kJ
• E) 112 kJ

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Definitions:

Machine-Hours

A measure of the amount of time a machine is operated within a given period.

Direct Labor-Hours

The total hours worked by employees who are directly involved in the production process.

Predetermined Overhead Rate

A rate calculated before a period begins, used to allocate estimated overhead costs to products based on a predetermined activity base.

Machine-Hours

A measure of the amount of time machines are operated in the production of goods or services, used as a basis for allocating manufacturing costs.