What Is the Enthalpy Change (In KJ) of a Chemical

question 137

Multiple Choice

What is the enthalpy change (in kJ) of a chemical reaction that raises the temperature of 250.0 mL of solution having a density of 1.25 g by 10.2 °C? (The specific heat of the solution is 3.733 J .)

• A) -7.43 kJ
• B) -12.51 kJ
• C) 8.20 kJ
• D) -11.9 kJ
• E) 6.51 kJ

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Definitions:

Standard Costs

Predetermined costs for materials, labor, and overhead that are used as benchmarks to measure actual performance and cost control.

Materials Quantity Variance

The difference between the actual quantity of materials used in production and the standard quantity expected to be used, multiplied by the standard cost per unit.

Direct Materials Purchases Variance

The difference between the actual costs of materials purchased and the expected (standard) costs.

Variable Overhead

Costs that fluctuate with changes in production volume, such as utilities or indirect materials, which are part of the overall overhead but vary with the level of output.