What is the standard enthalpy of formation of liquid diethylamine, (CH_3CH_2)_2N

Question

What is the standard enthalpy of formation of liquid diethylamine, (CH_3CH_2)_2NH? N_2O_5(g) + 8CH_4?(g) rightarrow 2(CH_3CH_2)_2 NH(l) + 5H_2O(l); delta H degree = -1500 kJ Substance N_2O_5(g) CH_4(g) H_2O(l) delta H degree (kJ/mo) +11.3 -74.9 -285.8 A) +660 kJ/mol B) -1060 kJ/mol C) +330 kJ/mol D) -660 kJ/mol E) -330 kJ/mol A What is the molality of a NaCl solution if there are 253.7 g of NaCl present in a sample containing 2500 g of water? The molar mass of NaCl is 58.44 g/mol. A) 2.776 m B) 1.736 m C) 3.454 m. D) 4.668 m E) none of these

Explanation / Answer

Q8-2

HRxn = Hproducts - Hreatants

-1500 = (2*X) + 5(-285.8) - (11.3 + 8*-74.9)

2X = -1500 - ( 5(-285.8) - (11.3 + 8*-74.9))

x = (658.9)/(-2) = -329.45 kJ/mol

choose E

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.