8) Answer is b). Because in reaction b), one mole NO2 is formed from its elements hence ∆H°rxn = ∆Hf(NO2)
9) Answer is d).
∆E = q+w = -12.4-4.2 = -16.6 J
Because heat release by system is negative and also work done by the system is also negative.
10) Answer is c).
64 g S releases -790 KJ heat
0.95 g S releases -790×0.95/64 = -12 KJ
11) Answer is B).
In this Reaction 2 moles of Al2O3 is formed. Hence,
∆Hf(Al2O3) = ∆H/2 = -3351/2 = -1676 KJ
8) For which one of the following reactions is AHⓇxn equal to the heat of formation...
please show me how to get the correct answers in preperation for my upcoming exam 20.) A 21.) A 20) The value of AH° for the reaction below is -1107 k]: 2Ba (s) +O2 (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 D) 96.3 kJ C) 26.3 kJ E) 46.4 kJ B) 193 kJ 21) The value of AH° for the following...
For which of the following reactions is AHºrx equal to the heat of formation for the product? a) N2(g) + 3H2(g) + 2NH3(g) b) Na (s) + 2Cl2 (1) NaCl (s) c) CH. (1) - 6C (s, graphite) + 3H2(g) X d) VP4 (s, white) + 2H2(g) + Br2 (1) - PH Br (1) e) 12C (g) + 11H2(g) + 110 (g) → CH22011 (g) X 6) Ammonia burns in air as follows: 4NH3(g) + 302 (g) 2N2 (g) +...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
please help me undersatnd how to solve the following two probekms below, thank you: What's change in enthalpy at 25 degrees Celsius and 1 atm for the production of 1. 0.345 mol of iron (III) oxide? 4Fe(s)+302(g)-> 2F€2O3(s); AH= -1651 kJ A)-570. kJ B)-285 kJ C)-1140 D)285 kJ E)570. kJ 2) Given the thermochemical equation 2A1203(s) 4Al(s)+302(g); AH = 3352kJ find AHH for the following reaction. 8Al(s)602(g)-»4A1203(s) a) 838 kJ b)1676 kJ c)-6704 kJ d)1676 kJ e) 6704 kJ
The value of AH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of Sis KJ. 25 (s) + 302 (9) ► 2503 (9) Select one: a. 12 b. -12 C.-790 d. 23 .-23
C Using the heats of formation below, calculate the heat of reaction for the following reaction: CH4(g) + H2O(g) → C2H5OH(E) AH® (kJ/mol) C2H4(g) 52.26 H2O(g) -241.8 C2H5OH(E) -235.1 kJ d Using the heats of formation below, calculate the heat of reaction for the following reaction: Fe2O3(s) + 2Al(s) - A1203(s) + 2Fe(s) AH(kJ/mol) Fe2O3(s) -824.2 Al(s) 0 Al2O3(s) -1676 Fe(s) 0 KJ
1). A sheet of aluminum foil with a mass of 25 g is taken from a room at 25° C and placed in a oven at 200.° C. How much heat does the aluminum absorb? The specific heat of aluminum is 0.90 J/g °C. 2). The value of AH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is 28 (s) + 302 (9) — 2503 (9)
What Are Thne spectator lons in The Heaction Bet.. Part A Which Electron Configuratin 9. What volume (mL) of a concentrated solution of magnesium chloride (9.00 M) must be diluted to 350 mL to make a 2. 75 M solution of magnesium chloride? O 100 75 107 50 30 Question 10 1 pts 10. What is the volume (mL) of a 0.827 M KOH (aq) required to neutralize 35.0 mL of 0.737 MH2SO4 (aq)? O 426 O 35.0 O18.4 62.4...
Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given enthalpy, but they aren't the same thing- correct? Also, if this question gave me delta-H, I know that the heat of formation for 4Al = 0 and 3O2 = 0 because they are elementary species. This would...
1. 10.0 501 uur g of water (specific heat, 4.184 J/g.K), initially at 25.0°C. What is the final temperature of th system in °C? 2. Given the enthalpy changes for the first two reactions, find the enthalpy change of the last reaction. S (s) + O2(g) → SO2 (g) AH° = -296.1 kJ 2503 (9) 2002 (g) + 02 (8) AH° = 198.2 kJ 2S(s) + 302(g) → 2503(g) AH = ? 3. Ethyl alcohol is produced by the fermentation...