Use the Bond Enthalpy Data Given to Estimate the Heat

question 119

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

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Definitions:

Absorption Costing

A methodology for product costing that comprehensively adds up the costs of direct materials, direct labor, and both fixed and variable manufacturing overheads.

Variable Costing

An accounting method that only includes variable costs (costs that change with production levels) in the cost of goods sold and treatment of fixed costs.

Production Costs

The total expenses incurred in the manufacture of products, including costs related to labor, raw materials, and overhead.

Variable Production Costs

Expenses that fluctuate with the level of output or production, including costs like raw materials and direct labor.