In each case, find the missing ∆Hºrxn(kJ/mole)
a. If 2 Al(s) + Fe2O3(s) ---- > Al2O3(s) + 2 Fe(s) ΔHrxno = -851.5kJ/mol
then
1/8 Al2O3(s) + 1/4 Fe(s) --- > 1/4 Al(s) + 1/8 Fe2O3(s) ΔHrxno = ?
b. If CaO(s) + 3 C(s) --- > CaC2(s) + CO(g) ΔHrxno = 464.8 kJ/mol
then
6 CaO(s) + 18 C(s) --- > 6 CaC2(s) + 6 CO(g) ΔHrxno = ?
c. If N2(g) + 2 O2(g) ---- > N2O4(g) ΔHrxno = 9.2 kJ/mol
and 2 NO2(g) ----- > N2(g) + 2 O2(g) ΔHrxno = -33.2 kJ/mol
then
3N2O4(g) ---- > 6 NO2(g) ΔHrxno = ?
a)
This reaction is -(1/8)*given reaction
So,
ΔHo rxn = -(1/8)*given ΔHo rxn
= -(1/8)*(-851.5)
= 106.4 KJ/mol
Answer: 106.4 KJ/mol
b)
This reaction is 6*given reaction
So,
ΔHo rxn = 6*given ΔHo rxn
= 6*(464.8)
= 2788.8 KJ/mol
Answer: 2788.8 KJ/mol
C)
Lets number the reaction as 1, 2, 3 from top to bottom
required reaction should be written in terms of other reaction
This is Hess Law
required reaction can be written as:
reaction 3 = -3 * (reaction 1) -3 * (reaction 2)
So, ΔHo rxn for required reaction will be:
ΔHo rxn = -3 * ΔHo rxn(reaction 1) -3 * ΔHo rxn(reaction 2)
= -3 * (9.2) -3 * (-33.2)
= 72.0 KJ
Answer: 72.0 KJ
3.(15 pts) In each case, find the missing AH (kJ/mole) (a) If 2Al(s) + Fe2O3(s) - > Al2O3(s) + 2 Fe(s) AH -851.5kJ/mol then 1/8 Al2O3(s) + 1/4 Fe(s) ---> 1/4 Al(s) + 1/8 Fe2O3(s) AHan = ? (b) If Cao(s) + 3 C(s) --> CaC(s) + CO(g) AH -464.8 kJ/mol then 6 CaO(s) + 18 C(s) -> 6 CaC2(s) +6 CO(g) AH = ? (c) If N2(g) + 2 02(g) ---> N2O(g) and 2 NO2(g) ---> N2(g) + 2...
3.(15pts) In each case, find the missing AH. (kJ/mole) (a) If 2 Al(s) + Fe2O3(s) ----> Al2O3(s) + 2 Fe(s) AH,xº = -851.5kJ/mol then 1/8 Al2O3(s) + 1/4 Fe(s) --> 1/4 Al(s) + 1/8 Fe2O3(s) AHX = ? (b) If CaO(8) + 3 C(s) --> CaC2(s) + CO(g) AH,” = 464,8 kJ/mol then 6 CaO(s) + 18 C(s) ---> 6 CaCz(s) +6 CO(g) AHX = ? (c) If N2(g) + 2 O2(g) ---> N204(g) and 2 NO2(g) ----> N2(g) +...
campus FDU Courses Student Services FDU Community Content Collection Course Documents > Homework Assignments Fall 19 > Homework Assignment 16 omework Assignment #6 3.(15pts) In cach case, find the missing me (a) If 2Al(s) + Fe 0 () ----> A1.0(s) + 2 Fe(s) AH.. = -851.5kJ/mol then 1/8 A1,0,(s) + 1/4 Fe(s) ---> 1/4 Al(s) + 1/8 Fe,0(s) AH... b) If CaC(s) + 3 C(s) ---> CaC(s) + CO(g) AH. = 464.8 kJ/mol then | 6 CaO(s) + 18 C(s)...
1) What is the ΔrG° for the following reaction (in kJ mol-1)? 2 Al (s) + Fe2O3 (s) ⇌ Al2O3 (s) + 2 Fe (s) 2) What is the ΔrG° for the following reaction (in kJ mol-1)? C6H12O6 (s, glucose) + 6 O2 (g) ⇌ 6 CO2 (g) + 6 H2O (l) 3) What is the ΔrG for the following reaction (in kJ mol-1) at 298 K? 2 Si (s) + 3 H2 (g) ⇌ Si2H6 (g) The conditions for...
. Use the equation below to calculate how much heat (in kJ) is evolved when 5.0 g of aluminium reacts with a stoichiometric amount of Fe2O3? 2 Al (s) + Fe2O3 (s) —>2 Fe (s) + Al2O3 (s) AH° = -852 kJ Determine the AHPrxn for the following reaction. {AH® (NH3) = -45.9 kJ/mol; AH°(O2) = 0; AH® (NO) = +91.3 kJ/mol; AH° (H2O) = -241.8 kJ/mol; 4 NH3 (g) + 5 O2 (g) — 4 NO (g) + 6...
Please help with these two questions :( 1. How much energy (in kJ) is evolved during the reaction of 76.9 g of Al, according to the reaction below? Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s) ΔH°rxn = -852 kJ Assume that there is excess Fe2O3. 2. A 12.43 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat capacity, C = 5.65 kJ/°C. C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(g) ΔH°rxn...
Which of the following processes is exothermic, given the following: N2(g) +2 02(g) --> N2O4(1) Дн° = 9.67 kJ/mol N2(g) +2 02(g) -->2 No2(9) Дн° = 6770 kJ/mol Multiple Choice 2 N2(g) +4 O2(g) --> 2 N2O4(1) o 2 N2(9) +4 O2(9) --> 4 NO2(9) o %N2(9) + O2(9) --> %N2O4(1) o N2O4() -> N2(9) + 2 029) o 2 N2(9) +4 O2(9) --> 2 No2(0) + N2O4(0)
need help with all Predict if the following reactions are exothermic or endothermic a) 2 H2(g) + O2(g/> 2 H2O(g) ΔΗ -484 kJ b) 2 Al(s) + Fe2O3(s) → 2 Fe(s) + Al2O3(s)AH =-852 kJ c) 2 H2O(g) 2 H2(g) + O2(g)AH :484 kJ d) 2 NH3(g) → N2(g) + 3 H2(g)AH = 92.2 kJ e) H2O(g) H2O(l) ΔΗ--44 kJ
How do you balance the equation for the reaction with an energy term in kcal as part of the equation? When N2(g) reacts with O2(g) to form NO2(g), 15.9 kcal of energy is absorbed for each mole of N2(g) that reacts. When Fe2O3(s) reacts with Al(s) to form Al2O3(s) and Fe(s), 204 kcal of energy is evolved for each mole of Fe2O3(s) that reacts. When CO2(g) reacts with H2(g) to form CO(g) and H2O(g), 9.85 kcal of energy is absorbed...
correct Question 4 0/2 pts Fe2O3(s) + 2Al(s) Al2O3(s) + 2 Fe(s) AH° = -851.5 kJ/mol If 75 g Fe2O3 is combined with 23 g Al, what is the value of q (kJ)? Enter your answer as an integer. 726