How Much Energy Is Required to Decompose 765 G of PCl₃

question 138

Multiple Choice

How much energy is required to decompose 765 g of PCl₃ according to the reaction below? The molar mass of PCl₃ is 137.32 g mol^-1 and may be useful. 4PCl₃(g) → P₄(s) + 6Cl₂(g) Δ_rH° = +1207 kJ

• A)2.31 × 10³ kJ
• B)4.33 × 103 kJ
• C)6.72 × 10³ kJ
• D)1.68 × 10³ kJ
• E)5.95 × 10³ kJ

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