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Enthalpy

Q. Imagine you start with a pot of 54g of water. The initial temperature of the pot and water is 100 degrees Celsius. If you leave this pot in a room that has a constant temperature of 105 degree Celsius , the water will spontaneously boil and you will end up with all water vapor at 105 degree Celsius. Please Answer A and B. Thank you

Solved • Apr 21, 2020

Enthalpy

Q. Calculate the enthalpy of combustion (delta Hcom) of propene (CH3-CH=CH2) using bond energies.

Solved • Apr 4, 2020

Enthalpy

Q. 20) The value of ∆H° for the reaction below is -1107 kJ: 2Ba (s) + O 2 (g) → 2BaO (s) How many kJ of heat are released when 5.75 g of Ba (s) reacts completely with oxygen to form BaO (s)? A) 23.2 kJ B) 193 kJ C) 26.3 kJ D) 96.3 kJ E) 46.4 kJ

Solved • Mar 26, 2020

Enthalpy

Q. When 56.8 g of lead reacts with 3.50 L of oxygen gas, measured at 1.00 atm and 25.0°C, 60.1 kJ of heat is released at constant pressure. What is ΔH° for this reaction? (R = 0.0821 L • atm/(K • mol))2Pb(s) + O2(g) → 2PbO(s)a. –4.39 × 102 kJb. –8.7 × 101 kJc. –6.01 × 101 kJd. –2.19 × 102 kJe. –4.2 × 102 kJ

Solved • Mar 19, 2020

Enthalpy

Q. Given the thermochemical equations X2 + 3Y2 → 2 XY3 ΔH1 = -340 kJ X2 + 2Z2 → 2 XZ2 ΔH2 = -180 kJ 2Y2 + Z2 → 2Y2Z ΔH3 = -240 kJ Calculate the change in enthalpy for the reaction. 4XY3+7Z2⟶6Y2Z+4XZ2

Solved • Mar 2, 2020

Enthalpy

Q. When a 0.303 g of sodium metal is added to an excess of hydrochloric acid, 3150 J of heat are produced. What is the enthalpy of the reaction as written? 2 Na(s) + 2 HCl(aq) → 2 NaCl(aq) + H2(g)

Solved • Mar 2, 2020

Enthalpy

Q. Which of the following statements is ALWAYS true about deposition? a) ΔG < 0 b) None of the other answers are correct c) ΔS > 0 d) ΔV < 0

Solved • Jan 28, 2020