What is the amount of heat released when 1.0 mole of NH3(g) is formed from its elements at 101.3 kPa and 298 K?
- Mayya Alocci
- Jun 24
- 1 min read
Regents Chemistry Exam January 2025 Question 42
42 What is the amount of heat released when 1.0 mole of NH3(g) is formed from its elements at 101.3 kPa and 298 K?
(1) 45.9 kJ (3) 137.7 kJ
(2) 91.8 kJ (4) 183.6 kJ
Solution:
Table I on the Reference Table shows the het of reaction for select reactions. We can find the reaction that produces NH3. It has Δ H of -91.8 kJ. However NH3 has a coefficient of 2 in front of it in the equation, representing 2 moles. The question is asking about the amount of heat produced for 1 mole, which means we need to divide by 2. Choice 1 is the correct answer.
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