Stoichiometric Amounts of Nitrogen Gas and Hydrogen Gas React in a Calorimeter

question 10

Multiple Choice

Stoichiometric amounts of nitrogen gas and hydrogen gas react in a calorimeter to produce 5.00 g of ammonia gas. The calorimeter temperature rises 0.42°C. The calorimeter and water have a combined heat capacity of 32.16 kJ/K. Calculate the heat of formation of ammonia, H_f^°, in kJ/mol. The formation reaction for ammonia is: 0.5N₂(g) + 1.5H₂(g)  NH₃(g) .

• A) -46 kJ/mol
• B) -13.5 kJ/mol
• C) -3.97 kJ/mol
• D) 3.97 kJ/mol
• E) 13.5 kJ/mol

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A glandular organ in the digestive and endocrine systems of vertebrates that produces hormones and digestive enzymes.

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An early stage of development in multicellular organisms, in humans it refers to the stage from fertilization until the end of the eighth week of pregnancy.