Use the Bond Enthalpy Data Given to Estimate the Heat $\equiv$

question 38

Multiple Choice

Use the bond enthalpy data given to estimate the heat released when 25.0 g of acetylene gas, C₂H₂, burns in excess oxygen to yield carbon dioxide and water vapor at 25°C. BE(C-C) = 347 kJ/mol
BE(C $\equiv$ C) = 812 kJ/mol
BE(C=O in CO₂) = 799 kJ/mol
BE(C-H) = 414 kJ/mol
BE(O-H) = 460 kJ/mol
BE(O=O) = 498.7 kJ/mol

• A)1180 kJ
• B)447 kJ
• C)364 kJ
• D)1230 kJ
• E)16.8 kJ

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Definitions:

Direct Labour Costs

Expenses related to employees who are directly involved in the production of goods or services.

Predetermined Overhead Rate

A rate used to allocate manufacturing overhead costs to individual units of production, based on estimated costs.

Direct Materials

These are raw materials that are directly traceable to the manufacturing of a product.

Direct Labour-Hours

The sum of working hours for employees actively participating in the manufacturing procedure.