In the Presence of Excess Oxygen, Methane Gas Burns in a Constant-Pressure

question 140

Multiple Choice

In the presence of excess oxygen, methane gas burns in a constant-pressure system to yield carbon dioxide and water: CH₄ (g) + 2O₂ (g) → + CO₂(g) + 2H₂O (l) Δ_rH = -890.0 kJ
Calculate the value of q (kJ) in this exothermic reaction when 1.90 g of methane is combusted at constant pressure.

• A)-105.7 kJ mol^-1
• B)0.0342 kJ mol^-1
• C)-0.0095 kJ mol^-1
• D)29.3 kJ mol^-1
• E)-1.06 × 10⁵ kJ mol^-1

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Definitions:

Process Costing

A costing method used for homogeneous products, where costs are accumulated over a period and assigned to large numbers of identical units.

Cost Per Equivalent Unit

A calculation used in process costing that determines the cost associated with a single unit of output, adjusting for partial completion of units in the production process.

Materials Cost

The cost of raw materials used to produce goods.

Process Costing

A method of costing that is used in industries where production is continuous and the product is indistinguishable from unit to unit.