What Quantity of Heat Is Required to Melt 2

question 127

Multiple Choice

What quantity of heat is required to melt 2.00 kg of iron at its melting point (1809 K) ? For iron, ΔH_fus = 13.80 kJ/mol.

• A) 0.385 kJ
• B) 6.90 kJ
• C) 27.6 kJ
• D) 494 kJ
• E) 771 kJ

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Definitions:

Significant Variances

Large or important differences between planned and actual performance or costs in a budget, project, or process.

Controlling Actions

Involves monitoring and adjusting strategies to ensure that goals and objectives are met efficiently and effectively.

Labour Efficiency Variance

A measure used in cost accounting to indicate the difference between the actual labor hours used and the standard labor hours planned for the production volume, often reflecting the efficiency of labor used.

Direct Material Price Variance

The difference between the actual cost of direct materials and the planned (or standard) cost, often used for budgeting and cost control.